{"title":"Exhausts for Honda Civic","description":"\u003ch2\u003eHigh-Flow Honda Civic Exhaust Systems \u0026amp; Replacement Components\u003c\/h2\u003e\n\u003cp\u003eUpgrading your setup with \u003ca href=\"\/collections\/honda-exhausts\"\u003eexhaust components compatible with Honda\u003c\/a\u003e eliminates factory restrictions, reduces thermal buildup, and delivers a deeper tone. Over years of daily driving, stock exhaust manifolds often crack around collector joints, while factory mufflers and mid-pipes succumb to corrosion. Installing mandrel-bent stainless headers, mid race pipes, or complete cat-back systems restores lost throttle response across 1988 through 2021 models equipped with 1.3L, 1.5L, 1.6L, 1.7L, 1.8L, 2.0L, and H22 engine setups. Pairing high-flow exhaust hardware with a \u003ca href=\"\/collections\/honda-performance-tune\"\u003eperformance tune for Honda\u003c\/a\u003e optimizes air-fuel mapping.\u003c\/p\u003e\n\u003ch3\u003eWill replacing the catalytic converter clear an active check engine light?\u003c\/h3\u003e\n\u003cp\u003eYes, installing a fresh catalytic converter resolves common emissions codes like P0420 by restoring proper exhaust gas conversion and factory-level backpressure.\u003c\/p\u003e\n\u003ch3\u003eAre these exhaust components direct replacements for factory hardware?\u003c\/h3\u003e\n\u003cp\u003eMost headers, mid-pipes, and cat-back assemblies bolt directly to factory mounting locations and hanger brackets without requiring custom metal fabrication or cutting.\u003c\/p\u003e\n\u003ch3\u003eShould I choose a header or a cat-back exhaust system?\u003c\/h3\u003e\n\u003cp\u003eAn exhaust header replaces restrictive factory exhaust manifolds right at the cylinder head to improve gas scavenging, while a cat-back system replaces downstream piping and mufflers to minimize backpressure.\u003c\/p\u003e","products":[{"product_id":"tri-y-exhaust-header-manifold-for-honda-civic-acura-integra-1992-2001-with-h22-engine","title":"Tri-Y Exhaust Header Manifold For Honda Civic SI Acura Integra (1992-2001) With H22 Engine","description":"\u003cp\u003e\u003cem\u003eEliminate restriction and restore the sharp, high-rpm throttle response your B-series or D-series build deserves.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eUpgrade Stainless Steel Exhaust Manifold Tri-Y Header for Acura Integra \u0026amp; Honda Civic SI* ONLY\u003c\/h2\u003e\n\u003cp\u003eIf you have spent any time running high-revving Honda powerplants, you know the factory cast-iron exhaust manifold is a massive bottleneck. Factory manifolds suffer from heavy, restrictive casting that chokes exhaust scavenge, trapping heat and burying top-end power. Whether you are dealing with cracked OEM runners or just trying to pull real power out of a VTEC head, stock plumbing holds your engine back.\u003c\/p\u003e\n\u003cp\u003eThis Tri-Y 4-2-1 exhaust header replaces that restrictive iron log with tuned, smooth-flowing T-304 stainless steel runners. The 4-2-1 Tri-Y geometry creates a dual-step scavenging effect that scavenges exhaust gases out of the combustion chamber faster. That means broader mid-range torque without sacrificing the top-end VTEC cross-over pull. Built with thick 3\/8\" CNC-machined flanges and 16-gauge tubing, it seals flat against the head to eliminate warp-induced exhaust leaks under high thermal stress.\u003c\/p\u003e\n\u003cp\u003eDesigned for performance B-series and D-series VTEC setups, this header opens up exhaust flow with an oversized 2.5\" collector. To bolt this up cleanly to your chassis, ensure you run a 2.5\" diameter adapter and a VTEC-compatible oil pan for adequate clearance.\u003c\/p\u003e\n\u003ch2\u003eWhy You Need This Upgrade\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized 4-2-1 Tri-Y Design:\u003c\/strong\u003e Maximizes low-end torque while smoothing out high-RPM exhaust scavenging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-304 Stainless Steel Construction:\u003c\/strong\u003e Resists rust, handles extreme exhaust gas temperatures, and features a polished finish.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHeavy-Duty 3\/8\" CNC Flanges:\u003c\/strong\u003e Prevents thermal warping to guarantee a leak-free seal against the cylinder head.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e16-Gauge Mandrel-Bent Piping:\u003c\/strong\u003e Ensures uniform pipe diameter throughout bends for maximum exhaust velocity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProven Power Gains:\u003c\/strong\u003e Unlocks an instant 10 to 15 horsepower and torque bump by lowering backpressure.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; margin-bottom: 20px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0; font-weight: bold;\"\u003eFitment\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0;\"\u003e1990-2001 Acura Integra \/ 1994-2000 Honda Civic \u0026amp; Del Sol\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0; font-weight: bold;\"\u003eEngine Code\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0;\"\u003eB-Series \/ D-Series (1.6L VTEC \u0026amp; Non-VTEC)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0; font-weight: bold;\"\u003eInstallation\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0;\"\u003eModerate (2-3 Hours) \/ Bolt-On with Hardware Included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0; font-weight: bold;\"\u003eMaterial\u003c\/td\u003e\n\u003ctd style=\"padding: 10px; border: 1px solid #e0e0e0;\"\u003eT-304 Stainless Steel \/ Polished Finish\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eInstallation Notes\u003c\/h3\u003e\n\u003cp\u003eThis system includes metal gaskets and mounting bolts as shown. Due to the wide 2.5\" collector outlet, fitting this header to your stock cat-back piping requires a 2.5\" exhaust adapter. This unit also requires the clearance provided by a VTEC motor oil pan. Professional installation is highly recommended to ensure proper torque specs and O2 sensor routing.\u003c\/p\u003e\n\u003ch3\u003eReplaces These OEM Applications \u0026amp; Part Numbers\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eHonda Civic \u003cstrong\u003eSi\u003c\/strong\u003e 1999 - 2000 (1.6L VTEC)\u003c\/li\u003e\n\u003cli\u003eHonda Del Sol 1994 - 1997 (1.6L VTEC)\u003c\/li\u003e\n\u003cli\u003eAcura Integra 1990 - 2001 1.8L\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp style=\"font-family: monospace; font-size: 0.9em; color: #666; background-color: #f5f5f5; padding: 10px; border-radius: 4px;\"\u003eIncluded: 1 X Header Exhaust System, Hardware as shown in the Picture above\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDitch the restrictive factory manifold and let your engine breathe freely across the entire rev range.\u003c\/strong\u003e\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47758408450296,"sku":"DS-CIVICINTEGRAMAINFOLD10320","price":427.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/honda-civic-acura-integra1__94725.1601747434.1280.1280.jpg?v=1769752895"},{"product_id":"stainless-steal-manifold-headers-for-honda-civic-ex-2001-2005-with-1-7l-sohc-engine","title":"Stainless Steal Manifold Header for Honda Civic EX (2001-2005) 1.7L SOHC Engine","description":"\u003cp\u003e\u003cem\u003eUpgrade your '01-'05 Civic EX with a performance header designed for the D17A2 1.7L engine—gain horsepower, improve throttle response, and enjoy a sportier exhaust note.\u003c\/em\u003e\u003c\/p\u003e\n\u003ch2\u003eWake Up Your D17A2: Real Gains, Real Performance\u003c\/h2\u003e\n\u003cp\u003eThe seventh-gen Civic EX earned its reputation as a dependable daily driver with excellent fuel economy and Honda's signature build quality. With the D17A2 1.7L engine under the hood, these cars delivered a solid 127 horsepower—enough to get the job done, but not exactly thrilling. For enthusiasts who wanted more, the aftermarket answered with proven bolt-on upgrades that extract hidden potential without compromising reliability.\u003c\/p\u003e\n\u003cp\u003eThis stainless steel header is one of the most effective first mods you can make. By replacing the restrictive factory exhaust manifold with a high-flow 4-into-1 design, you're giving your engine the breathing room it's been missing. The result is an instant 10-15 horsepower and torque gain, sharper throttle response, and a deeper, more aggressive exhaust tone that turns heads without being obnoxious.\u003c\/p\u003e\n\u003ch3\u003eKey Features at a Glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eT-304 Stainless Steel Construction:\u003c\/strong\u003e Superior corrosion resistance and heat tolerance compared to mild steel, ensuring years of trouble-free performance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized 4-1 Design:\u003c\/strong\u003e Efficiently merges exhaust gases to reduce backpressure and improve engine scavenging across the RPM range.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.50\" Primaries \/ 2.25\" Collector:\u003c\/strong\u003e Tuned specifically for the D17A2's displacement and flow characteristics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Gasket Included:\u003c\/strong\u003e High-quality gasket ensures a leak-free seal right out of the box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eInstallation \u0026amp; Fitment\u003c\/h3\u003e\n\u003cp\u003eThis header is a direct bolt-on replacement for your factory manifold. While experienced DIYers with basic hand tools can tackle the install, professional installation is highly recommended to ensure proper fitment and torque specs. Everything you need is included—hardware, gasket, and the header itself—so you can get it installed and start enjoying the gains immediately.\u003c\/p\u003e\n\u003ch3\u003eDurability \u0026amp; Material Details\u003c\/h3\u003e\n\u003cp\u003eT-304 stainless steel isn't just a fancy marketing term—it's a material engineered to handle the extreme heat cycles and road conditions your Civic faces. Unlike mild steel headers that rust and crack after a few winters, this header maintains its structural integrity and appearance season after season. It's a smart investment that pays off in both performance and longevity.\u003c\/p\u003e\n\u003ch3\u003eYour Benefits at a Glance\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNoticeable Power Increase:\u003c\/strong\u003e Feel the difference during acceleration and highway merging.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced Exhaust Sound:\u003c\/strong\u003e A sportier tone that reflects your Civic's performance potential.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFoundation for Future Mods:\u003c\/strong\u003e Pairs perfectly with a cold air intake or cat-back exhaust for even more gains.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eFitment:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2001-2005 Honda Civic EX\u003c\/li\u003e\n\u003cli\u003eD17A2 1.7L 4-Cylinder engines only\u003c\/li\u003e\n\u003cli\u003eVerify compatibility with your specific year and model before ordering\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003ePackage Includes:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Stainless Steel Header\u003c\/li\u003e\n\u003cli\u003e1 x Metal Exhaust Gasket\u003c\/li\u003e\n\u003cli\u003eAll necessary mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47758457340152,"sku":"DS-HONCIVHEAD-01","price":124.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/cv1__93002.1680411177.1280.1280.jpg?v=1767729606"},{"product_id":"long-tube-header-race-manifold-for-honda-civic-si-acura-rsx-base-2002-2006-stainless","title":"Long Tube Header Race Manifold for Honda Civic SI \u0026 Acura RSX Base (2002-2006) Stainless Steel","description":"\u003cdiv class=\"product-description\"\u003e\n\u003ch2\u003eStainless Steel 4-2-1 Race Header with Downpipe for 2002-2005 Honda Civic Si \u0026amp; 2002-2006 Acura RSX Base 2.0L\u003c\/h2\u003e\n\u003cdiv class=\"intro-section\"\u003e\n\u003cp\u003eThe seventh-generation Honda Civic Si and first-generation Acura RSX Base share more than just Honda's legendary K20 engine—they share a philosophy. These cars represent Honda's commitment to naturally aspirated performance, proving that driving excitement doesn't require turbochargers or excessive displacement. With rev-happy engines that sing to 8,000 RPM and chassis tuned for pure driving engagement, these platforms earned their place in Honda's performance hall of fame.\u003c\/p\u003e\n\u003cp\u003eBut even Honda's engineers had to make compromises. Your factory cast-iron exhaust manifold is one of them—restrictive, heavy, and engineered for cost rather than performance. Every time you hit VTEC, every spirited drive through your favorite roads, you're experiencing exhaust backpressure that's literally choking your K20's ability to breathe. It's time to unleash what Honda's naturally aspirated masterpiece was always capable of with a proper 4-2-1 race header—the upgrade that transforms your Si or RSX from quick to genuinely fast.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eThe 4-2-1 Design Advantage\u003c\/h2\u003e\n\u003cp\u003eNot all headers are created equal, and design matters tremendously for naturally aspirated Honda engines. Our 4-2-1 configuration isn't just different from cheaper 4-1 designs—it's specifically engineered to optimize exhaust scavenging and maximize power across the entire RPM range, especially where naturally aspirated K-series engines live: the mid-range to redline.\u003c\/p\u003e\n\u003cp\u003eHere's how it works: The 4-2-1 design merges exhaust pulses in two stages, first pairing cylinders strategically to enhance scavenging effect, then combining those pairs into a single collector. This optimized pulse timing helps draw exhaust gases out of the cylinders more efficiently while creating a vacuum effect that assists fresh intake charge into the combustion chamber. The result? Significant horsepower and torque gains throughout your powerband, with especially noticeable improvements in VTEC's sweet spot where your K20 truly comes alive.\u003c\/p\u003e\n\u003ch2\u003eFeel the K20 Breathe Freely\u003c\/h2\u003e\n\u003cp\u003eInstall this header and experience your Civic Si or RSX Base transformed from the first drive. That restrictive factory manifold has been suffocating your engine's potential—remove it, and your K20 finally breathes the way Honda's engineers originally intended. Throttle response sharpens immediately across every gear. Mid-range pull becomes noticeably stronger for confident passing and spirited driving. When VTEC engages, the power delivery intensifies with even more dramatic top-end rush toward that glorious 8,000 RPM redline.\u003c\/p\u003e\n\u003cp\u003eThese aren't subtle improvements you'll question whether you can feel. This is transformation you'll notice from your first acceleration onto the highway, your first pull through the gears, your first spirited canyon run. Your naturally aspirated Honda finally produces the power its high-revving architecture was designed to deliver—power that's been waiting all along, trapped behind restrictive factory exhaust flow.\u003c\/p\u003e\n\u003ch2\u003ePremium Stainless Steel Construction\u003c\/h2\u003e\n\u003cp\u003eEngineered from high-quality stainless steel, this header system is built to withstand the extreme temperatures and harsh conditions of high-performance exhaust operation. Unlike mild steel headers that rust and deteriorate within a few years, stainless steel resists corrosion, maintains its structural integrity, and delivers decades of reliable performance—even in salt-belt winters, humid coastal climates, or dusty desert conditions.\u003c\/p\u003e\n\u003cp\u003eThe precision TIG and MIG welded construction ensures leak-free performance and maximum durability. Every tube, every merge collector, every weld is executed to professional-grade standards that guarantee perfect fitment and long-lasting reliability. These aren't thin-wall budget headers that crack after a few thousand hard miles—this is robust construction built to handle aggressive driving, track days, and daily use for as long as you own your Honda or Acura.\u003c\/p\u003e\n\u003ch3\u003ePrecision CNC-Machined Flanges\u003c\/h3\u003e\n\u003cp\u003eThe foundation of any quality header is its flanges, and ours are CNC-machined for absolute precision. Perfectly flat mating surfaces ensure leak-free sealing against your cylinder head and connection to your exhaust system. The precise machining guarantees proper alignment and bolt hole positioning, eliminating the frustration of misaligned bolt holes or warped flanges that plague cheaper alternatives.\u003c\/p\u003e\n\u003cp\u003eThese substantial flanges won't warp under extreme heat cycling like thinner designs. They maintain dimensional stability through countless temperature cycles from cold starts to hard driving, ensuring your header continues sealing perfectly year after year. This is the quality difference between a header you'll install once and forget about versus one you'll constantly fight with gasket leaks and alignment issues.\u003c\/p\u003e\n\u003ch2\u003eOptimized Primary Tube Sizing\u003c\/h2\u003e\n\u003cp\u003eFeaturing 1.75\" primary tubes merging to a 2.50\" outlet, this header is specifically engineered to optimize exhaust velocity and scavenging for naturally aspirated K20 engines. The primary tube diameter is carefully calculated to maintain exhaust gas velocity—critical for effective scavenging—while the larger outlet ensures unrestricted flow to your exhaust system.\u003c\/p\u003e\n\u003cp\u003eThis sizing represents years of development and dyno testing on K-series platforms. Too small, and you create unnecessary backpressure. Too large, and you lose exhaust velocity, killing low and mid-range torque. Our dimensions hit the sweet spot, maximizing real-world performance across the RPM range you actually use, not just peak numbers at redline that look good on paper but sacrifice drivability.\u003c\/p\u003e\n\u003ch2\u003eComplete Header and Downpipe System\u003c\/h2\u003e\n\u003cp\u003eThis isn't just a header that leaves you searching for compatible downpipes and custom fabrication. Our complete system includes both the 4-2-1 header and matching downpipe, providing a comprehensive exhaust solution from your cylinder head to your cat-back exhaust system. Everything is designed to work together, ensuring optimal flow, perfect fitment, and maximum performance gains without compatibility concerns or additional fabrication costs.\u003c\/p\u003e\n\u003ch2\u003eYour Key Benefits at a Glance\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSignificant Horsepower Gains:\u003c\/strong\u003e Free-flowing 4-2-1 design unleashes hidden K20 performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eImproved Torque Across RPM Range:\u003c\/strong\u003e Enhanced scavenging delivers stronger mid-range pull\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSharper Throttle Response:\u003c\/strong\u003e Reduced backpressure means immediate power delivery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOptimized VTEC Performance:\u003c\/strong\u003e Even more dramatic power delivery when VTEC engages\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAggressive Exhaust Note:\u003c\/strong\u003e Deep, throaty sound that announces your Honda's performance intentions\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-2-1 Race Design:\u003c\/strong\u003e Optimized pulse timing for maximum naturally aspirated performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePremium Stainless Steel:\u003c\/strong\u003e Corrosion-resistant construction built to last decades\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTIG \u0026amp; MIG Welded:\u003c\/strong\u003e Professional-grade construction ensures durability and leak-free performance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC-Machined Flanges:\u003c\/strong\u003e Precision fit guarantees proper sealing and alignment\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.75\" Primary Tubes:\u003c\/strong\u003e Optimized diameter maintains exhaust velocity for effective scavenging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.50\" Outlet:\u003c\/strong\u003e Large collector ensures unrestricted flow to exhaust system\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete System:\u003c\/strong\u003e Includes header and downpipe—no additional fabrication required\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eThe Legendary Honda Exhaust Note\u003c\/h2\u003e\n\u003cp\u003eStart your engine and immediately hear the transformation. Your K20 announces itself with a deep, aggressive tone that's unmistakably Honda performance. Gone is the muted, restricted sound of factory cast iron. In its place is the raw, mechanical symphony of a free-flowing exhaust system doing its job properly.\u003c\/p\u003e\n\u003cp\u003eUnder acceleration, the exhaust note intensifies to that characteristic Honda howl enthusiasts live for. When VTEC kicks in, the sound becomes even more intoxicating—a high-pitched scream that climbs toward redline, announcing to everyone within earshot that you're driving a proper performance Honda. This is the authentic sound of naturally aspirated K-series performance, the audible confirmation that your engine is finally breathing freely and producing maximum power.\u003c\/p\u003e\n\u003ch2\u003eProfessional Installation Highly Recommended\u003c\/h2\u003e\n\u003cp\u003eHeader installation requires working underneath your vehicle, dealing with seized exhaust components, and ensuring proper fitment and alignment. While experienced DIY mechanics with proper equipment can successfully install this header, we highly recommend professional installation to ensure optimal results and avoid common pitfalls.\u003c\/p\u003e\n\u003cp\u003eA qualified exhaust shop or Honda\/Acura performance specialist has the proper lifts, penetrating oils, cutting tools if needed, and expertise to complete this installation efficiently and correctly. They'll ensure perfect alignment, proper torque specifications, leak-free sealing, and correct clearances—giving you peace of mind and maximum performance from day one.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Note:\u003c\/strong\u003e This product does not include installation instructions. Please refer to a factory service manual or consult with a professional shop familiar with Honda\/Acura platforms for proper installation procedures. Professional installation ensures you avoid the frustrations of seized bolts, alignment issues, and potential mistakes that can turn a straightforward upgrade into a weekend-ruining nightmare.\u003c\/p\u003e\n\u003ch2\u003ePrecision Fitment for Your Platform\u003c\/h2\u003e\n\u003cp\u003eThis 4-2-1 race header with downpipe is specifically engineered for:\u003c\/p\u003e\n\u003ch3\u003eHonda Civic Si\/SiR (2002-2005)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAll 2.0L DOHC K20A3 engines\u003c\/li\u003e\n\u003cli\u003eEP3 chassis (hatchback)\u003c\/li\u003e\n\u003cli\u003eBoth manual transmission models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eAcura RSX Base (2002-2006)\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eAll 2.0L DOHC K20A3 engines\u003c\/li\u003e\n\u003cli\u003eDC5 chassis\u003c\/li\u003e\n\u003cli\u003eBoth manual and automatic transmission models\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eImportant Compatibility Note:\u003c\/strong\u003e This header is designed specifically for base RSX and Civic Si models with the K20A3 engine. It is NOT compatible with RSX Type-S models, which use the higher-output K20A2\/K20Z1 engine and require different header specifications.\u003c\/p\u003e\n\u003ch2\u003eWhy Factory Manifolds Hold Back Performance\u003c\/h2\u003e\n\u003cp\u003eHonda designed your factory cast-iron exhaust manifold to meet emissions standards, minimize production costs, and reduce noise—not to maximize performance. The result is a restrictive manifold with sharp internal bends, small ports, and inefficient design that creates significant exhaust backpressure, literally fighting against your engine's ability to expel exhaust gases efficiently.\u003c\/p\u003e\n\u003cp\u003eEvery time you press the accelerator, especially in VTEC's high-RPM range, your engine wastes energy forcing exhaust through those restrictions. Your cylinders can't refill with fresh air-fuel mixture as quickly or completely. Power output suffers. Throttle response lags. Your K20 works harder to produce less power than its architecture is capable of delivering.\u003c\/p\u003e\n\u003cp\u003eA proper 4-2-1 race header eliminates every one of those restrictions. Individual primary tubes for each cylinder create optimal exhaust flow with strategic pulse timing. Smooth mandrel bends maintain consistent diameter for maximum velocity. The two-stage collector design optimizes scavenging effect. Your engine finally breathes as Honda's engineers originally envisioned—freely, efficiently, powerfully.\u003c\/p\u003e\n\u003ch2\u003ePerfect Foundation for Your Build\u003c\/h2\u003e\n\u003cp\u003eWhether your Civic Si or RSX Base is completely stock or you're planning comprehensive modifications, this header serves as the perfect foundation. It complements other bolt-ons like cold air intakes, cat-back exhausts, and ECU tuning by eliminating a major bottleneck in your engine's breathing.\u003c\/p\u003e\n\u003cp\u003eRunning stock? You'll see significant gains immediately. Planning future mods? This header is built to handle increased power from tuning, camshafts, or even forced induction down the road. The robust stainless steel construction and optimized design mean this header grows with your build, continuing to deliver performance whether you're at 160 horsepower or pushing significantly more.\u003c\/p\u003e\n\u003ch2\u003eTrack-Ready Performance, Street-Legal Use\u003c\/h2\u003e\n\u003cp\u003eThis header is designed to handle the demands of spirited street driving, canyon carving, and even track day abuse. The stainless steel construction withstands extreme temperatures without warping or cracking. The precision welds hold strong under vibration and stress. The CNC-machined flanges maintain sealing through countless heat cycles.\u003c\/p\u003e\n\u003cp\u003eMany Honda enthusiasts run this exact header configuration for weekend autocross, time attack events, and track days, then drive home on the same setup. This is real-world durability proven by thousands of miles of hard use across various driving conditions and applications.\u003c\/p\u003e\n\u003ch2\u003eThe Upgrade Every K20 Deserves\u003c\/h2\u003e\n\u003cp\u003eYour Honda Civic Si or Acura RSX Base represents Honda engineering at its finest—naturally aspirated performance that prioritizes driver engagement over raw specs, high-revving character over low-end torque, mechanical purity over electronic nannies. These are the last of a dying breed: proper driver's cars built when Honda still prioritized enthusiasts.\u003c\/p\u003e\n\u003cp\u003eHonor that heritage with modifications that enhance rather than compromise Honda's engineering philosophy. This 4-2-1 race header doesn't change your K20's character—it amplifies everything that makes it special. The rev-happy nature becomes more pronounced. The VTEC transition becomes more dramatic. The driving experience becomes more engaging. This is your Si or RSX, just better in every measurable way.\u003c\/p\u003e\n\u003ch2\u003eJoin the K-Series Community\u003c\/h2\u003e\n\u003cp\u003eThousands of Honda and Acura enthusiasts have already discovered the transformation a proper 4-2-1 header delivers. Browse any K-series forum, check out build threads, read dyno results—the evidence is overwhelming. This isn't just a supporting mod; it's often the single most impactful bolt-on upgrade you can make to a naturally aspirated K20, delivering noticeable performance gains that justify its place as a first or second modification for serious enthusiasts.\u003c\/p\u003e\n\u003cp\u003eYour seventh-gen Civic Si or first-gen RSX Base deserves to perform at its absolute best. Give your K20 the breathing system it was always meant to have—one that respects Honda's naturally aspirated philosophy while eliminating the cost-driven compromises that held it back from the factory.\u003c\/p\u003e\n\u003ch2\u003eExperience Your K20's True Potential\u003c\/h2\u003e\n\u003cp\u003eStop accepting restrictive cast-iron manifolds that limit your engine's capabilities. Stop settling for sluggish throttle response and muted VTEC transitions. Stop wondering what your Civic Si or RSX could feel like with proper exhaust flow. Your K20 was engineered to deliver enthusiastic, rev-happy performance—it's time to experience what Honda's naturally aspirated masterpiece can truly achieve.\u003c\/p\u003e\n\u003cp\u003eThis 4-2-1 race header isn't about chasing dyno numbers or bragging rights. It's about unlocking the performance Honda built into your engine, restoring the driving excitement these platforms are famous for, and hearing that intoxicating naturally aspirated howl that defines Honda performance culture. This is how you modify a Honda properly: with purpose, with quality, with respect for the engineering excellence already present.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReady to unleash your K20's true naturally aspirated potential? Add this 4-2-1 Race Header System to your cart today and experience the horsepower, torque, sound, and throttle response you've been missing. Your Civic Si or RSX Base—and every spirited drive ahead—will never be the same.\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/div\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47758489223416,"sku":"DS-CIV-EXH-SI","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/CIVIC1__97211.1667344879.1280.1280.jpg?v=1771430629"},{"product_id":"stainless-steel-manifold-header-for-acura-rsx-honda-civic-si-sir-2002-2006-2-0l-dohc-dc5-engine","title":"Stainless Steel Manifold Headers for Acura RSX \u0026 Honda Civic Si SiR (2002-2006) 2.0L DOHC DC5 Engine","description":"\u003cdiv class=\"product-description\"\u003e\n\u003ch1\u003eStainless Steel Shorty Header for 2002-2006 Acura RSX Base \u0026amp; 2002-2005 Civic Si\u003c\/h1\u003e\n\u003cdiv class=\"intro-paragraph\"\u003e\n\u003cp\u003eThe K20A3 and K20A2\/K20Z1 engines represent Honda's legendary K-series engineering—high-revving four-cylinders that reward proper modifications with genuine performance gains. Your base RSX or Civic Si features proven VTEC technology that comes alive at high RPM, but restrictive factory exhaust manifolds limit power throughout the range. Our precision-engineered shorty header eliminates this bottleneck, unlocking mid-range torque and top-end power while adding the aggressive exhaust note that makes wringing out a Honda so addictive.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003ch2\u003eOptimize Your K-Series Powerband\u003c\/h2\u003e\n\u003cp\u003eExperience immediate improvements across the RPM range as precision 1-5\/8\" mandrel-bent primaries feeding a 2-1\/2\" collector optimize exhaust scavenging. The shorty design focuses gains where you drive most—idle through mid-range RPM—delivering stronger pull from low revs while maintaining top-end breathing for those glorious runs to redline. Feel enhanced throttle response, improved acceleration, and the mechanical symphony of a properly-breathing K-series engine that Honda enthusiasts crave.\u003c\/p\u003e\n\u003ch2\u003eRace-Quality Construction, Street Reliability\u003c\/h2\u003e\n\u003cp\u003eCrafted from premium 16-gauge 304 stainless steel with full mandrel bending throughout, this header delivers lasting performance. Laser-cut 3\/8\" thick head flanges are hydraulically pressed flat for leak-free sealing, while professional TIG welding at every joint prevents cracking under thermal stress. Chrome-plated flanges resist corrosion where temperatures are highest, and the polished finish protects against rust while looking stunning in your engine bay. This is the quality serious Honda builders demand.\u003c\/p\u003e\n\u003ch2\u003eDirect Bolt-On Installation\u003c\/h2\u003e\n\u003cp\u003eDesigned specifically for base RSX and Civic Si applications with proper port matching and factory mounting points. All necessary accessories shown in photos are included for complete installation. Note: This header is engineered for base RSX models with K20A3 engines and does NOT fit Type-S models, which have different port configurations.\u003c\/p\u003e\n\u003cdiv class=\"fitment-info\"\u003e\n\u003ch3\u003ePerfect Fitment For:\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e2002-2006 Acura RSX Base\u003c\/strong\u003e - 2.0L K20A3 (Type-S models excluded)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2002-2005 Honda Civic Si \/ SiR\u003c\/strong\u003e - 2.0L K20 Series\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"cta\"\u003e\n\u003cp\u003e\u003cstrong\u003eUnleash your K-series potential.\u003c\/strong\u003e Experience genuine power gains, enhanced sound, and the quality your Honda deserves. Shop now.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47758489878776,"sku":"DS-MNFLD-DOHC","price":149.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/rsx1__16818.1674678749.1280.1280.jpg?v=1767731886"},{"product_id":"exhaust-mid-race-pipe-for-honda-civic-2001-2005-1-7l-engine","title":"Exhaust Mid Race Pipe for Honda Civic (2001-2005) 1.7L Engine","description":"\u003ch2\u003eHigh-Flow Exhaust Mid Race Pipe for 2001-2005 Honda Civic (D17\/EM2)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the restrictive factory mid-section with a straight-through 2.25-inch mandrel-bent T-304 stainless steel pipe to maximize exhaust gas velocity and reduce parasitic backpressure on 1.7L D-series engines.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Bottleneck\u003c\/h3\u003e\n\u003cp\u003eThe OEM exhaust piping on the 7th Generation Civic is engineered primarily for cabin silence and mass-production cost-savings rather than thermal efficiency or flow. These factory units utilize mild steel that is highly susceptible to corrosion and feature necked-down diameters at the resonator and flange points. This creates significant internal turbulence and heat soak, which hinders the scavenging process on the D17A2 engine. For the performance enthusiast, these restrictions trap heat near the manifold and force the engine to expend energy pushing spent gases through a narrow, muffled passage, resulting in sluggish throttle response and a muted exhaust profile.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis mid race pipe is engineered from high-grade T-304 stainless steel, providing a permanent solution to the thermal fatigue and oxidation common in factory mild steel components. By utilizing a consistent 2.25-inch diameter throughout, the pipe eliminates the 'choke points' found in the stock assembly. The mandrel-bending process ensures that the internal cross-sectional area remains uniform through every curve, optimizing laminar flow and increasing exhaust gas scavenging. The 3-bolt flange design and included hardware facilitate a secure, leak-free connection to the existing manifold and rear section, while the polished finish and 2.25-inch round design ensure long-term structural integrity and a refined, aggressive tone under load.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2001-2005 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD17A1, D17A2 \/ EM2, ES1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e115-127 hp \/ 110-114 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eUL105AU164PS069\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eT-304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001-2005 Honda Civic EX 2DR (Coupe)\u003c\/li\u003e\n  \u003cli\u003e2001-2005 Honda Civic EX 4DR (Sedan)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda JDM Standard\u003c\/h3\u003e\n\u003cp\u003eThis race pipe provides the necessary flow for enthusiasts looking to extract the full potential of the D17 platform. It delivers the precise fitment and material durability required for high-RPM JDM applications, ensuring improved throttle response and a crisp, resonant exhaust note without the restrictive baffles of stock hardware.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47999420596472,"sku":"DS-ES9JRDE0Y","price":169.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-mid-race-pipe-for-honda-civic-2001-2005-1-7l-engine-1.webp?v=1771366269"},{"product_id":"exhaust-muffler-for-honda-civic-hatchback-1988-1991-1-5l-engine","title":"Exhaust Muffler for Honda Civic Hatchback (1988-1991) 1.5L Engine","description":"\u003ch2\u003eHigh-Flow Stainless Steel Exhaust Muffler for 1988-1991 Honda Civic (D15\/ED)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the restrictive factory muffler assembly with a 2.25-inch straight-through mandrel-bent system to reduce backpressure and improve exhaust scavenging on D-series powerplants.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Exhaust Weakness\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust system on the 1988-1991 Honda Civic Hatchback was engineered for basic commuting, utilizing small-diameter mild steel piping that is highly susceptible to internal corrosion and baffle failure after decades of service. These OEM units often feature restrictive 1.5-inch to 1.75-inch diameters and press-bent curves that create significant turbulence and backpressure. This bottleneck prevents the D15 engine from efficiently expelling spent combustion gases, particularly at higher RPMs where gas velocity is critical. Furthermore, the stock mild steel construction lacks the thermal resilience required to withstand repeated heat cycles without scaling and eventual structural degradation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis performance upgrade utilizes high-grade T304 stainless steel with a consistent 2.25-inch piping diameter to maximize laminar flow and volumetric efficiency. The system features a 4.5-inch rounded, slanted tip constructed with 14mm thick double-walled stainless steel, providing superior heat insulation to prevent bumper melting and chrome discoloration. Unlike the stock baffled mufflers, this straight-through design utilizes high-density packing to manage acoustics while eliminating the flow disruptions inherent in OEM chambers. The 2-bolt flange connection is precision-machined for a high-tension seal, ensuring leak-free operation under the high-vibration environments typical of 4th Gen Civic chassis setups. The chrome-polished finish provides a protective oxide layer, significantly outlasting factory aluminized steel components.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1988-1991 Honda Civic Hatchback\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD15 (D-Series) \/ ED\/EF\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e92 hp \/ 88 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eui106AU52PT284\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePiping Diameter\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2.25\" Inlet \/ 2.25\" Main\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1988-1991 Honda Civic Hatchback (1.5L Engine)\u003c\/li\u003e\n  \u003cli\u003eNote: Does Not Fit Coupe or Sedan Models\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda JDM Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered for the EF\/ED enthusiast, this system respects the high-revving nature of the Honda D-series engine. By increasing the bore to 2.25 inches, it provides the necessary overhead for basic bolt-on modifications without the rasp typically found in thinner-walled, low-grade exhaust kits. This is a durable, performance-oriented replacement designed for consistent flow and mechanical longevity.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":47999426691320,"sku":"DS-EJNYBKKEP","price":239.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-muffler-for-honda-civic-hatchback-1988-1991-1-5l-engine-1.webp?v=1771367541"},{"product_id":"catback-exhaust-for-honda-civic-coupe-2012-2015-1-8l","title":"Catback Exhaust for Honda Civic Coupe (2012-2015) 1.8L Engine","description":"\u003ch2\u003eHigh-Flow Catback Exhaust for 2012-2015 Honda Civic (R18\/FG3)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eReplaces the restrictive factory exhaust assembly with a mandrel-bent, high-diameter system to optimize exhaust scavenging and reduce parasitic power loss on R18-powered coupes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Bottleneck\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust system on the 9th-gen Civic is engineered primarily for noise suppression and cost-efficiency rather than flow dynamics. The OEM piping utilizes small-diameter, crush-bent tubing that creates significant internal turbulence and backpressure. For the R18Z1 engine, this restriction prevents efficient cylinder clearing during the exhaust stroke, particularly in the mid-to-high RPM range. Furthermore, the standard baffled muffler acts as a secondary obstruction, trapping heat and muffling the natural resonance of the engine at the expense of throttle response and low-end torque.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis catback system utilizes high-quality aluminized steel with computerized mandrel-bending to ensure a consistent 2.5-inch OD flow path without the diameter collapses found in stock units. By increasing the piping to a 3-inch ID at critical junctions, the system dramatically lowers backpressure, allowing for an estimated gain of 20-25 HP depending on supporting modifications. The design features a high-performance oval canister muffler and a 3.5-inch double-walled slanted tip, which provides superior thermal management and a deep, aggressive tone. The precision-welded hangers ensure a direct-fit installation on the FG3 chassis, utilizing factory mounting points for a secure, rattle-free finish.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2012-2015 Honda Civic (2-Door Coupe Only)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eR18Z1 \/ FG3\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e140 hp \/ 128 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2012 Honda Civic 2-Dr Coupe 1.8L\u003c\/li\u003e\n  \u003cli\u003e2013 Honda Civic 2-Dr Coupe 1.8L\u003c\/li\u003e\n  \u003cli\u003e2014 Honda Civic 2-Dr Coupe 1.8L\u003c\/li\u003e\n  \u003cli\u003e2015 Honda Civic 2-Dr Coupe 1.8L\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNote:\u003c\/strong\u003e Does NOT fit Si Models or Sedan variants.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda JDM Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered for the enthusiast looking to improve the breathing capabilities of the R18 platform, this system balances aggressive acoustics with measurable flow improvements. It delivers the signature deep sound expected from a performance JDM build while maintaining the durability required for daily street use.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48004582179064,"sku":"DS-E1APEGRG4","price":339.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catback-exhaust-for-honda-civic-coupe-2012-2015-1-8l-1.webp?v=1771541037"},{"product_id":"catback-exhaust-for-honda-civic-1992-2000-1-6l","title":"Catback Exhaust for Honda Civic (1992-2000) 1.6L Engine","description":"\u003ch2\u003eHigh-Flow T-304 Catback Exhaust for 1992-2000 Honda Civic (D16\/EJ-EK) (No Hatchback)\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the restrictive factory exhaust system with high-flow T-304 stainless steel piping to optimize exhaust scavenging and improve engine breathing for the D16 engine family.\u003c\/p\u003e\n\u003ch3\u003eThe Stock Civic Exhaust Constraint\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust on the 1992-2000 Civic is engineered for maximum noise suppression and manufacturing cost-efficiency rather than gas-flow dynamics. Utilizing small-diameter mild steel tubing, the OEM setup is highly susceptible to internal corrosion and features 'crush-bent' sections that significantly reduce the effective inner diameter at every curve. These bottlenecks create turbulent backpressure that traps heat near the cylinder head and prevents the 1.6L D-series engines from reaching peak volumetric efficiency. This is especially detrimental to VTEC-equipped models, where the high-cam profile requires rapid gas evacuation to realize power gains in the upper RPM range.\u003c\/p\u003e\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis catback system is a direct-fit engineering upgrade constructed from premium T-304 stainless steel, ensuring long-term resistance against thermal fatigue and oxidation. The 2.25\" ID piping is processed through computer-controlled mandrel bending to maintain a constant cross-sectional area, eliminating the flow separation found in stock components. The assembly features TIG-welded CNC machine flanges for high-pressure structural integrity and leak prevention. The straight-through round canister muffler utilizes high-density internal packing to produce an aggressive, deep-tone profile without the restrictive baffles of the stock unit. Finished with a 4\" double-walled tip, the system optimizes exhaust velocity and provides a significant reduction in backpressure for improved throttle response.\u003c\/p\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid rgb(224, 224, 224); font-size: 14px; height: 78.3856px;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"background-color: rgb(249, 249, 249); height: 19.5964px;\"\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003e1992-2000 Honda Civic (Coupe\/Sedan)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5964px;\"\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003eD16 Family \/ EG, EH, EJ, EK, EM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background-color: rgb(249, 249, 249); height: 19.5964px;\"\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003e106-127 hp \/ 103-107 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5964px;\"\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; height: 19.5964px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1992-1995 Honda Civic 1.6L Coupe (EJ1\/EJ2)\u003c\/li\u003e\n\u003cli\u003e1992-1995 Honda Civic 1.6L Sedan (EG8\/EH9)\u003c\/li\u003e\n\u003cli\u003e1996-2000 Honda Civic EX 1.6L (EJ8)\u003c\/li\u003e\n\u003cli style=\"font-weight: bold;\"\u003e\u003cstrong\u003eNote: Does NOT fit Hatchback (EK9\/EG6) models\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eThe Honda Performance Standard\u003c\/h3\u003e\n\u003cp\u003eFor the golden-era JDM enthusiast, this exhaust is a foundational modification. It provides the necessary flow capacity for future engine builds, whether staying naturally aspirated or moving toward forced induction, while delivering the iconic deep-tone resonance that characterizes a high-performance Honda build.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48005007311096,"sku":"DS-EFLKT6LYJ","price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catback-exhaust-for-honda-civic-1992-2000-1-6l-1.webp?v=1771876006"},{"product_id":"exhaust-muffler-pipes-for-honda-civic-dx-lx-2001-2007-1-7l","title":"Exhaust Muffler Pipes for Honda Civic DX LX (2001-2007) 1.7L","description":"\u003ch2\u003eHigh-Flow Catback Exhaust System for 2001-2007 Honda Civic\u003c\/h2\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eDesigned specifically for the EM2 and ES1 chassis, this high-flow catback exhaust replaces the restrictive factory piping to reduce exhaust backpressure and optimize engine efficiency.\u003c\/strong\u003e\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Stock Civic Exhaust Bottleneck\u003c\/h3\u003e\n  \u003cp\u003eThe factory exhaust system on the 7th generation Honda Civic, specifically models equipped with the D17 non-VTEC engine, is notoriously restrictive. OEM engineers prioritize cost-saving and sound suppression over exhaust gas velocity, utilizing narrow-diameter, crush-bent steel pipes. Over time, these factory mild-steel components become highly susceptible to rust and structural fatigue, especially at the flanges and muffler connections. Furthermore, the baffled chamber design within the OEM muffler creates significant backpressure, trapping heat near the exhaust ports and causing sluggish throttle response. This turbulent exhaust flow stifles the D17 engine’s ability to efficiently scavenge exhaust gases from the combustion chamber, artificially limiting both horsepower and low-end torque.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n  \u003cp\u003eThis performance catback exhaust system completely re-engineers the exhaust tract from the catalytic converter rearward. Constructed from premium T-304 stainless steel, it offers vastly superior thermal threshold and corrosion resistance compared to OEM mild steel. The system features computerized mandrel bends throughout its 2.25-inch inner diameter (ID) main piping, ensuring a constant cross-sectional area that prevents exhaust gas bottlenecking. By replacing the restrictive factory baffles with a low-restriction, straight-through muffler design and tuned resonator, exhaust scavenging is significantly improved. Flanges are CNC-machined and TIG-welded to prevent exhaust leaks and withstand intense operating pressures. This engineered flow dynamic reduces exhaust gas temperatures, provides an aggressive, deep tonal signature without excessive drone, and allows the 1.7L engine to breathe freely for improved volumetric efficiency.\u003c\/p\u003e\n  \n  \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2001-2007 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD17 (1.7L) \/ EM2, ES1\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e115 hp \/ 110 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n \n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e2001-2005 Honda Civic (DX \/ LX)\u003c\/li\u003e\n    \u003cli\u003e\u003cem\u003eNote: Do Not Fit EX \u0026amp; Si Models\u003c\/em\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eThe Honda Performance Caliber\u003c\/h3\u003e\n  \u003cp\u003eMaximizing flow efficiency and exhaust velocity is essential for the D-series powerplant. Upgrading your exhaust geometry unlocks previously restricted throttle response and delivers the deep, refined exhaust note expected from a properly tuned JDM platform.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48321601044728,"sku":"DS-ESDCQCVPO","price":199.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-muffler-pipes-for-honda-civic-dx-lx-2001-2007-1-7l-1.webp?v=1777868750"},{"product_id":"exhaust-muffler-pipes-for-honda-civic-ex-2001-2007-1-7l","title":"Exhaust Muffler Pipes for Honda Civic EX (2001-2007) 1.7L","description":"\u003ch2\u003eHigh-Flow N1 Catback Exhaust System for 2001-2007 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces the restrictive factory exhaust piping and baffled muffler with a straight-through T-304 stainless steel N1-style system to maximize exhaust gas velocity and deliver a deep, resonant exhaust note.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock EM2\/ES1 Civic Exhaust Bottleneck\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust system on the 1.7L D17-powered Honda Civic relies on narrow-diameter mild steel piping and heavily baffled, chambered mufflers designed strictly for noise suppression. Over time, these OEM components are highly susceptible to rust and corrosion, especially around the steel flanges and factory welds. More importantly, the restrictive internal muffler chambers create significant exhaust backpressure, which impedes the scavenging effect required for optimal volumetric efficiency. This fluid dynamic bottleneck limits high-RPM exhaust flow, resulting in a muted exhaust tone and restricting the naturally aspirated potential of the 1.7L engine under load.\u003c\/p\u003e\n\n\u003ch3\u003eThe N1-Style Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis N1 single-tip catback exhaust system resolves factory flow limitations by utilizing CNC-machined T-304 stainless steel, vastly improving resistance to heat cycling and environmental corrosion. The transition from 2.5-inch (63.5mm) inlet piping to stepped 3.0-inch (76.2mm) main piping creates an ideal pressure differential, accelerating exhaust gas evacuation while maintaining enough flow velocity to prevent low-end torque loss. The TIG-welded steel flanges ensure a rigid, leak-free seal capable of withstanding severe chassis vibration. Terminating in a 4.5-inch (114.3mm) polished tip, the straight-through muffler design eliminates internal baffling, substantially reducing backpressure while producing an aggressive, motorsport-inspired tone. Pre-welded hangers align directly with factory mounting points for a secure, direct bolt-on fitment without undercarriage modification.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2001-2007 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD17 (1.7L) \/ EM2, ES1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e127 hp \/ 114 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001-2005 Honda Civic EX (Direct Fit)\u003c\/li\u003e\n  \u003cli\u003e2001-2005 Honda Civic DX \/ LX (Requires the use of EX model headers\/converters)\u003c\/li\u003e\n  \u003cli\u003eNote: Does Not Fit Si Hatchback Models (EP3)\u003c\/li\u003e\n  \u003cli\u003eNote: No installation guides included; professional installation highly recommended.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Tuning Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to unlock the characteristic aggressive sound and throttle response of JDM tuning, this N1 catback system delivers the precise flow dynamics and robust T-304 construction required by enthusiasts pushing the D-Series platform.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48321602126072,"sku":"DS-E9Q7VNSEG","price":229.95,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-muffler-pipes-for-honda-civic-ex-2001-2007-1-7l-1.webp?v=1777868801"},{"product_id":"exhaust-headers-for-honda-civic-1988-2000-1-5l-1-6l","title":"Exhaust Headers for Honda Civic (1988-2000) 1.5L 1.6L","description":"\u003ch2\u003eHigh-Flow Exhaust Headers for 1988-2000 Honda Civic\u003c\/h2\u003e\n  \n  \u003cp\u003e\u003cstrong\u003eReplaces the restrictive factory cast-iron exhaust manifold to improve exhaust scavenging and lower engine bay temperatures.\u003c\/strong\u003e\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Stock D-Series Shortcoming\u003c\/h3\u003e\n  \u003cp\u003eThe OEM cast-iron exhaust manifolds found on the D15 and D16 SOHC engines are notoriously restrictive, designed primarily for cost-effective mass production and emissions compliance rather than optimized flow. Over decades of thermal cycling, these heavy factory manifolds are prone to heat retention, cracking along the collector, and excessive heat soak within the engine bay. The internal surface of the factory cast manifold is rough, creating turbulent airflow that impedes exhaust gas velocity, increases backpressure, and ultimately stifles the engine's volumetric efficiency across the RPM band.\u003c\/p\u003e\n  \n  \u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n  \u003cp\u003eThis 2-piece 4-2-1 exhaust header system is engineered to maximize exhaust gas velocity and eliminate the backpressure inherent to the factory setup. Constructed from CNC-machined T-304 stainless steel, the mandrel-bent piping maintains a consistent diameter throughout the primary and secondary tubes. The 4-2-1 design optimizes mid-range torque and high-RPM horsepower by improving the exhaust scavenging effect. Computerized TIG-welded flanges ensure structural integrity and a leak-free seal under extreme thermal stress. Featuring a 1.75-inch inlet and a 2.0-inch outlet, this header smoothly transitions exhaust gases out of the cylinder head. Pre-welded hangers align perfectly with factory mounting points, ensuring a direct bolt-on installation without the need for custom fabrication or cutting.\u003c\/p\u003e\n  \n  \u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1988-2000 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD-Series SOHC (D15, D16) \/ EF, EG, EK\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e70-127 hp \/ 83-107 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n \n  \u003ch3\u003eCompatibility\u003c\/h3\u003e\n  \u003cul\u003e\n    \u003cli\u003e1988-1991 Honda CRX (D-Series SOHC Engines Only)\u003c\/li\u003e\n    \u003cli\u003e1993-1997 Honda Del Sol (D-Series SOHC Engines Only)\u003c\/li\u003e\n    \u003cli\u003e1988-2000 Honda Civic (D-Series SOHC Engines Only)\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch3\u003eThe Honda Performance Standard\u003c\/h3\u003e\n  \u003cp\u003eBuilt for the dedicated tuner, this header delivers the crisp exhaust note, enhanced throttle response, and optimized powerband required for naturally aspirated JDM performance builds.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48328122204408,"sku":"DS-E3789CLFZ","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/exhaust-headers-for-honda-civic-1988-2000-1-5l-1-6l-1.webp?v=1778011925"},{"product_id":"long-tube-exhaust-header-manifold-honda-civic-2006-2011-1-8l","title":"Long Tube Exhaust Header Manifold Honda Civic (2006-2011) 1.8L","description":"\u003ch2\u003eHigh-Flow Long Tube Exhaust Header for 2006-2011 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eReplaces the restrictive factory cast iron manifold and integrated catalytic converter to significantly reduce exhaust backpressure and maximize exhaust gas scavenging.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Exhaust Restriction\u003c\/h3\u003e\n\u003cp\u003eThe factory R18 cast manifold is engineered primarily for rapid catalyst light-off and manufacturing cost reduction, resulting in severe exhaust gas restriction. The integrated catalytic converter creates a massive choke point right at the cylinder head, increasing localized heat soak and driving up exhaust gas temperatures (EGTs). This inherent backpressure limits the engine's volumetric efficiency, stifling high-RPM horsepower and mid-range torque, while heavily dampening exhaust velocity. Furthermore, extreme thermal cycling over years of use can lead to stress cracks in the dense OEM cast unit, leading to exhaust leaks and inaccurate oxygen sensor readings.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis long tube header eliminates the factory bottleneck by utilizing computerized mandrel-bent, high-quality stainless steel tubing. The precise bends maintain a constant inner diameter, promoting optimal exhaust gas velocity and uninterrupted laminar flow out of the combustion chamber. Utilizing a massive 3.5-inch inlet transitioning to a 2.5-inch outlet via a large bell-mouth design, it maximizes exhaust scavenging effects to draw spent gases out efficiently. Heavy-duty 3\/8-inch thick CNC-machined flanges ensure a completely flat, warp-free seal against the cylinder head, while double-pass TIG welding guarantees structural integrity under continuous extreme temperatures. This fluid dynamic design frees up an estimated 10 to 15 horsepower and torque by allowing the 1.8L to breathe without restriction.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2006-2011 Honda Civic 1.8L\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eR18A1 \/ FA1, FG1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e140 hp \/ 128 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eFits 2006-2011 Honda Civic 1.8L (Excluding Hybrid and GX models)\u003c\/li\u003e\n  \u003cli\u003eDoes NOT fit Honda Civic Si Models\u003c\/li\u003e\n  \u003cli\u003eDoes NOT fit Honda Civic Hybrid Models\u003c\/li\u003e\n  \u003cli\u003eDoes NOT fit Honda Civic GX Models\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Performance Standard\u003c\/h3\u003e\n\u003cp\u003eBy alleviating backpressure and managing thermal loads more effectively, this header unlocks the authentic power profile of the R18 platform. It provides a deeper, aggressively tuned exhaust note while drastically improving mid-range throttle response and top-end engine performance.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48959512543480,"sku":"DS-ERENCWLP4","price":204.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/long-tube-exhaust-header-manifold-honda-civic-2006-2011-1-8l-1.webp?v=1782250108"},{"product_id":"performance-intake-manifold-throttle-body-for-honda-civic-ex-crx-1988-2000-1-6l","title":"Performance Intake Manifold Throttle Body for Honda Civic EX CRX (1988-2000) 1.6L","description":"\u003ch2\u003eHigh-Flow Cast Aluminum Intake Manifold \u0026amp; Throttle Body for 1988-2000 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eUpgrades the restrictive factory intake manifold to optimize volumetric efficiency, maximize plenum volume, and lower intake air temperatures for high-revving D-Series engines.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Airflow Bottleneck\u003c\/h3\u003e\n\u003cp\u003eThe OEM cast aluminum intake manifolds on D-Series engines prioritize low-end drivability and NVH reduction over peak airflow flow. The factory plenum volume is excessively small, and the runners are relatively narrow and rough-cast, which chokes airflow velocity past 5,500 RPM. This creates a severe bottleneck for modified engines, limiting mid-range torque and stifling top-end horsepower gains. Furthermore, the stock 55mm to 56mm throttle body opening becomes a significant restriction when introducing aggressive cam profiles or forced induction, inducing pressure drops that rob the engine of its breathing capacity and throttle response.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis performance intake manifold addresses these OEM airflow limitations through a completely redesigned, high-volume plenum and optimized, short-runner architecture. Manufactured from premium, heat-dissipating cast aluminum, it maximizes the venturi effect to force high-velocity air into the combustion chambers. The manifold features an oversized 66mm throttle body opening—which can be safely port-matched up to 70mm—allowing for massive improvements in intake charge volume. By combining this larger plenum with smoother runner transitions, the manifold delivers profound increases in mid-range torque and aggressive top-end power, effectively eliminating the factory choke point for serious naturally aspirated or turbocharged D-Series builds.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1988-2000 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD-Series (D15\/D16) \/ EF, EG, EK\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e108-127 hp \/ 100-107 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1988-2000 Honda Civic (CX, DX, EX, GX, HX, LX)\u003c\/li\u003e\n  \u003cli\u003e1993-1997 Honda Civic del Sol (S, Si)\u003c\/li\u003e\n  \u003cli\u003e1988-1991 Honda CRX (Base, HF, Si)\u003c\/li\u003e\n  \u003cli\u003e1987 Honda Wagovan (DX)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompatible Engine Codes:\u003c\/strong\u003e Honda D15A2, B1, B2, B6, B7, B8, Z1 and D16A6, Y7, Y8, Z6\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment Note 1:\u003c\/strong\u003e Not compatible with OEM D-series throttle body. Must use a larger-bore throttle body or similar.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment Note 2:\u003c\/strong\u003e Not directly compatible with Civic Wagon or Wagovan; clearance modifications required.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment Note 3:\u003c\/strong\u003e Not directly compatible with 96-00 Civic; brake proportioning valve and fuel filter clearance required.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Performance Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the high-revving nature of classic JDM powerplants, this intake setup ensures your D-Series breathes freely at redline while delivering the aggressive induction howl characteristic of properly tuned Honda engines.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":48959558516984,"sku":"DS-E0V2PUQC7","price":189.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/performance-intake-manifold-throttle-body-for-honda-civic-ex-crx-1988-2000-1-6l-1.webp?v=1781583027"},{"product_id":"catalytic-converter-for-honda-civic-2001-2005-1-7l","title":"Catalytic Converter for Honda Civic (2001-2005) 1.7L","description":"\u003ch2\u003eDirect-Fit Catalytic Converter Assembly for 2001-2005 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Replaces degraded factory catalytic converters and front piping to restore correct exhaust backpressure, ensure clean emissions burn, and eliminate P0420 catalytic efficiency trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Exhaust Weakness\u003c\/h3\u003e\n\u003cp\u003eAging 7th-generation Civic exhaust assemblies regularly suffer from internal washcoat depletion and substrate core sintering after extended thermal cycling. In addition, OEM mild steel flanges and thin-wall factory piping deteriorate from road brine and road vibrations, creating stubborn pinhole leaks at the weld junctions and triggering chronic OBD-II catalyst efficiency faults.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered with heavy-gauge stainless steel tubing and precision computerized mandrel bends, this direct-fit unit maintains laminar exhaust scavenging without restricting exhaust gas velocity. The high-porosity ceramic substrate incorporates a dense precious metal washcoat to maximize oxygen storage capacity (OSC) for precise closed-loop fueling. Heavy-duty OE-profile flanges and pre-welded O2 sensor bungs ensure a direct bolt-on installation without cutting or custom fabrication.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2001-2005 Honda Civic 1.7L\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD17A1 \/ D17A2 \/ D17A6 • EM2 \/ ES1 \/ ES2\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e115-127 hp \/ 110-114 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e58425, 18405, 0991102\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001-2005 Honda Civic DX, LX, EX, HX (1.7L L4 SOHC)\u003c\/li\u003e\n  \u003cli\u003eChassis codes: EM2 (Coupe), ES1\/ES2 (Sedan)\u003c\/li\u003e\n  \u003cli\u003eCompliance: EPA OBD-II Federal Emissions Standard (Not legal for sale or use in CA, ME, or NY)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Standard\u003c\/h3\u003e\n\u003cp\u003eDesigned to deliver factory-level backpressure management and OE-spec acoustic damping, keeping your high-revving D-series powertrain compliant, quiet, and running at peak thermal efficiency without throwing check engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50464433406200,"sku":"DS-EINN0BAFB","price":139.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2001-2005-1-7l-1.jpg?v=1788880701"},{"product_id":"catalytic-converter-for-honda-civic-1996-2000-1-6l","title":"Catalytic Converter for Honda Civic (1996-2000) 1.6L","description":"\u003ch2\u003eDirect-Fit Replacement Catalytic Converter for 1996-2000 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e Restores factory exhaust scavenging, clears P0420 diagnostic trouble codes, and ensures proper emissions compliance for 1.6L D-series engines.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Substrate Failure\u003c\/h3\u003e\n\u003cp\u003eHigh-mileage 6th generation Civic exhaust systems routinely suffer from thermal shock and carbon fouling, causing the internal factory ceramic brick to disintegrate or melt. This breakdown increases exhaust backpressure, chokes top-end cylinder evacuation, and triggers emissions failure codes. Additionally, aged factory steel casing flanges fatigue and corrode, creating persistent pre- and post-catalyst exhaust leaks.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed with a heavy-gauge stainless steel outer shell, this replacement converter offers superior resistance to thermal fatigue and road salt corrosion. The internal high-flow ceramic substrate is engineered with an optimized cell density that maximizes surface contact for exhaust gas conversion without restricting exhaust velocity. It features precision-welded, OEM-spec mounting flanges and integrated O2 sensor bungs, providing an exact bolt-on fitment with supplied hardware and seals.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e1996-2000 Honda Civic 1.6L\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eD16 \/ EK, EJ\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e106-127 hp \/ 103-107 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBER418590 (Interchange: 13096, 099884, 16096, 642597, 840301)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1996 Honda Civic 1.6L\u003c\/li\u003e\n  \u003cli\u003e1997 Honda Civic 1.6L\u003c\/li\u003e\n  \u003cli\u003e1998 Honda Civic 1.6L\u003c\/li\u003e\n  \u003cli\u003e1999 Honda Civic 1.6L\u003c\/li\u003e\n  \u003cli\u003e2000 Honda Civic 1.6L\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for the high-revving characteristics of Honda D-series powertrains, this converter maintains correct backpressure dynamics to preserve low-end torque while promoting unrestricted flow across the entire RPM band.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50484870742264,"sku":"DS-EWLJDI2BH","price":199.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-1996-2000-1-6l-1.jpg?v=1789107487"},{"product_id":"catalytic-converter-for-honda-civic-2006-2011-1-8l","title":"Catalytic Converter for Honda Civic (2006-2011) 1.8L","description":"\u003ch2\u003eDirect-Fit Catalytic Converter for 2006-2011 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eDirect-fit replacement:\u003c\/strong\u003e Restores exhaust scavenging efficiency and eliminates P0420 catalytic efficiency diagnostic trouble codes on 8th-generation Civics.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Manifold Converter Deterioration\u003c\/h3\u003e\n\u003cp\u003eThe factory integrated exhaust manifold-converter assembly on the R18 engine experiences intense thermal cycling due to its close-coupled placement against the cylinder head. Over time, sustained operating temperatures cause internal washcoat thermal degradation and structural breakdown of the ceramic honeycomb substrate. Carbon loading and oil blow-by common to aging variable valve timing engines contaminate precious metal sites, resulting in reduced exhaust throughput, increased backpressure, and persistent check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered to original equipment dimensional tolerances, this replacement unit utilizes a high-durability stainless steel exterior shell that resists exterior corrosion and thermal fatigue. Inside, a dense ceramic monolith core coated with active catalytic washcoat materials maximizes surface contact area to efficiently convert hydrocarbons, carbon monoxide, and NOx without choking exhaust flow. Precision-machined, OE-spec flanges and integrated O2 sensor bungs ensure a leak-free seal without custom cutting or pipe modification.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2006-2011 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eR18A1 1.8L I4 \/ FA1 (Sedan), FG1 (Coupe)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e140 hp \/ 128 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBER458340 (Interchange: 16448, 31383, 31722, 35129)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006-2011 Honda Civic DX 1.8L L4\u003c\/li\u003e\n  \u003cli\u003e2006-2011 Honda Civic EX 1.8L L4\u003c\/li\u003e\n  \u003cli\u003e2006-2011 Honda Civic LX 1.8L L4\u003c\/li\u003e\n  \u003cli\u003e2009-2011 Honda Civic DX-G 1.8L L4\u003c\/li\u003e\n  \u003cli\u003e2009-2011 Honda Civic LX-S 1.8L L4\u003c\/li\u003e\n  \u003cli\u003e2011 Honda Civic EX-L 1.8L L4\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for high-revving Honda i-VTEC platforms, this catalytic converter restores factory exhaust velocity and clean engine response without altering the signature intake or exhaust note.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50487878582520,"sku":"DS-E81E1NOUO","price":114.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2006-2011-1-8l-1.jpg?v=1789142390"},{"product_id":"catalytic-converter-for-honda-civic-2012-2013-1-8l","title":"Catalytic Converter for Honda Civic (2012-2013) 1.8L","description":"\u003ch2\u003eDirect-Fit Catalytic Converter for 2012-2013 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eReplaces degraded or clogged factory emissions units to restore factory backpressure, exhaust gas scavenging, and clear catalyst-efficiency Diagnostic Trouble Codes.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Civic Catalyst Degradation and Thermal Fatigue\u003c\/h3\u003e\n\u003cp\u003eThe factory catalytic converter on the 1.8L Civic encounters extreme thermal cycling due to its close-coupled position near the cylinder head exhaust port. Over extended operation, high heat and vibration cause washcoat sintering, catalyst degradation, and micro-fracturing across the ceramic monolith. This structural breakdown increases exhaust backpressure, restricts volumetric efficiency, and inevitably trips persistent P0420 diagnostic trouble codes on the 9th-generation platform.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eFabricated with a corrosion-resistant stainless steel outer shell, this replacement converter resists thermal distortion and harsh underbody environments. The high-efficiency ceramic substrate features an optimized cell density and precious-metal loading to maximize surface contact, effectively oxidizing unburned hydrocarbons without choking flow. OE-spec flanges ensure flat, leak-free sealing with the included hardware and gaskets, while the integrated oxygen sensor boss maintains correct probe depth for precise closed-loop ECU fuel trimming.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eFitment\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e2012-2013 Honda Civic (1.8L)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eEngine \/ Chassis\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eR18Z1 \/ FB2 (Sedan), FG1 (Coupe)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003eStock Output\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003e140 hp \/ 128 lb-ft (Approx)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:8px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:8px;\"\u003eBER638490\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2012 Honda Civic 1.8L L4 (Coupe, Sedan - DX, EX, EX-L, HF, LX)\u003c\/li\u003e\n  \u003cli\u003e2013 Honda Civic 1.8L L4 (Coupe, Sedan - EX, EX-L, HF, LX)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eThe Honda Precision Standard\u003c\/h3\u003e\n\u003cp\u003eCalibrated to meet factory OBD-II emissions protocols, this converter preserves OEM engine response and acoustic levels without triggering secondary O2 sensor CEL faults or introducing cabin drone.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50488433737976,"sku":"DS-ER129P8K7","price":116.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2012-2013-1-8l-1.jpg?v=1789149546"},{"product_id":"catalytic-converter-for-honda-civic-2006-2010-1-3l-rear","title":"Catalytic Converter for Honda Civic (2006-2010) 1.3L Rear","description":"\u003ch2\u003eDirect-Fit Rear Catalytic Converter for 2006-2010 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Rear Catalytic Converter restores compliant emissions treatment and unimpeded exhaust scavenge on the 2006-2010 Civic 1.3L to eliminate P0420 diagnostic trouble codes and optimize powertrain efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Catalyst Breakdown and Backpressure Restriction\u003c\/h3\u003e\n\u003cp\u003eOver extended duty cycles, the factory downstream catalytic converter on the \u003cstrong\u003eFA3\u003c\/strong\u003e chassis experiences thermal washcoat depletion, sintering of internal precious metal matrices, and ceramic substrate fragmentation. In the lean-burn \u003cstrong\u003eLDA2\u003c\/strong\u003e hybrid powertrain, exhaust temperature fluctuations and carbon buildup degrade downstream reduction efficiency, triggering persistent check engine lights and choking secondary exhaust flow, which robs fuel economy and engine torque.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis rear catalytic converter assembly is engineered with a corrosion-resistant stainless steel outer shell and thick, precision-machined direct-fit flanges. Internally, a high-flow ceramic honeycomb substrate is coated with a high-grade catalytic washcoat to maximize emissions conversion without generating excessive exhaust backpressure. Precision robotically welded seams prevent pinhole exhaust leaks, ensuring exact downstream O2 sensor readouts and restoring standard backpressure characteristics to match OEM specifications.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2006-2010 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eLDA2 (1.3L) \/ FA3\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e110 hp \/ 123 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e17393, 16439, 642003\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006 Honda Civic Hybrid Sedan 1.3L 4-Cylinder\u003c\/li\u003e\n  \u003cli\u003e2007 Honda Civic Hybrid Sedan 1.3L 4-Cylinder\u003c\/li\u003e\n  \u003cli\u003e2008 Honda Civic Hybrid Sedan 1.3L 4-Cylinder\u003c\/li\u003e\n  \u003cli\u003e2009 Honda Civic Hybrid Sedan 1.3L 4-Cylinder\u003c\/li\u003e\n  \u003cli\u003e2010 Honda Civic Hybrid Sedan 1.3L 4-Cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FA3 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2006-2010 Honda Civic equipped with the \u003cstrong\u003eLDA2\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve downstream P0420 catalyst efficiency trouble codes?\u003c\/strong\u003e\u003cbr\u003e Yes, replacing a degraded factory unit with this fresh ceramic substrate assembly restores correct chemical conversion and returns downstream oxygen sensor readings to normal operating parameters.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Efficiency Benchmark\u003c\/h3\u003e\n\u003cp\u003eEngineered to satisfy exacting JDM emissions parameters and backpressure tolerances, this replacement unit preserves factory low-end torque response while keeping exhaust gas velocity clean and unrestricted.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501079597304,"sku":"DS-E25B5GM1Q","price":133.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2006-2010-1-3l-rear-1.jpg?v=1789325938"},{"product_id":"catalytic-converter-for-honda-civic-2006-2011-2-0l-front","title":"Catalytic Converter for Honda Civic (2006-2011) 2.0L Front","description":"\u003ch2\u003eDirect-Fit Front Catalytic Converter for 2006-2011 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit front catalytic converter restores factory exhaust flow, reduces tailpipe emissions, and eliminates P0420 catalytic efficiency codes on 2006-2011 Honda Civic 2.0L models.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Catalyst Degradation and Thermal Fatigue\u003c\/h3\u003e\n\u003cp\u003eThe high-revving nature of the \u003cstrong\u003eK20Z3\u003c\/strong\u003e engine subjects the stock catalytic converter to extreme exhaust gas temperatures and sustained vibrational harmonics. Over time, the factory substrate suffers washcoat breakdown, cell sintering, and eventual core blockage. This degradation creates elevated exhaust backpressure, robbing high-RPM VTEC power, increasing engine operating temps, and triggering persistent check engine lights (DTC P0420). Additionally, the OEM flanges often corrode, compromising the seal and causing pre-converter exhaust leaks.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eEngineered as a bolt-on replacement, this catalytic assembly utilizes a heavy-gauge stainless steel outer shell designed to resist road salt corrosion and severe thermal cycling. Inside, a durable ceramic honeycomb substrate features an optimized washcoat of precious metals to ensure full chemical conversion of HC, CO, and NOx emissions. Laser-cut mating flanges ensure an exact match to the factory exhaust manifold and intermediate pipe, preserving proper O2 sensor placement without custom welding. The package includes heavy-duty replacement hardware and high-temperature seals to eliminate exhaust leaks and restore factory scavenging dynamics.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2006-2011 Honda Civic 2.0L\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eK20Z3\u003c\/strong\u003e \/ \u003cstrong\u003eFG2\u003c\/strong\u003e (Coupe), \u003cstrong\u003eFA5\u003c\/strong\u003e (Sedan)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e197 hp \/ 139 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\u003cstrong\u003e16695\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006-2011 Honda Civic Si Coupe 2.0L L4 (\u003cstrong\u003eFG2\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2007-2011 Honda Civic Si Sedan 2.0L L4 (\u003cstrong\u003eFA5\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FG2 and FA5 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2006-2011 Honda Civic equipped with the \u003cstrong\u003eK20Z3\u003c\/strong\u003e 2.0L engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this converter resolve a P0420 diagnostic trouble code?\u003c\/strong\u003e\u003cbr\u003e Yes, it provides the required chemical conversion efficiency to satisfy downstream oxygen sensor monitoring and clear P0420 faults when paired with functioning O2 sensors.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Performance Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to withstand the demanding exhaust velocity of Honda's high-revving DOHC i-VTEC platform, this catalytic assembly preserves factory exhaust harmonics while ensuring clean, reliable operation across the entire RPM band.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501652578552,"sku":"DS-E0VKUKHNL","price":167.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2006-2011-2-0l-front-1.jpg?v=1789329214"},{"product_id":"catalytic-converter-for-honda-civic-2016-2021-1-5l-front","title":"Catalytic Converter for Honda Civic (2016-2021) 1.5L Front","description":"\u003ch2\u003eDirect-Fit Stainless Front Catalytic Converter for 2016-2021 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit front catalytic converter restores factory exhaust backpressure and emissions compliance on 2016-2021 Honda Civic 1.5L turbocharged models to clear diagnostic trouble codes and prevent boost-creep issues caused by failing substrates.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Catalyst Degradation and Thermal Stress\u003c\/h3\u003e\n\u003cp\u003eFactory primary catalytic converters on the turbocharged \u003cstrong\u003eL15B7\u003c\/strong\u003e engine sit directly off the turbine discharge where exhaust gas temperatures routinely exceed 1,400°F. Over extended heat cycles and sustained boost exposure, the fragile OEM washcoat degrades, leading to thermal sintering, fractured ceramic cell matrices, and restricted exhaust flow. This substrate breakdown elevates pre-turbine backpressure, spikes cylinder head temperatures, and invariably triggers persistent \u003cstrong\u003eP0420\u003c\/strong\u003e diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis front catalytic converter assembly is engineered with a high-durability ceramic honeycomb substrate coated with precious metals to ensure efficient HC, CO, and NOx conversion without choking post-turbo flow dynamics. Housed in heavy-gauge \u003cstrong\u003eStainless Steel\u003c\/strong\u003e, the direct-fit casing incorporates robotic TIG welds and thick CNC-machined flanges that resist thermal warping under high exhaust gas velocity. Integrated factory-positioned \u003cstrong\u003eO2 sensor bungs\u003c\/strong\u003e preserve proper upstream and downstream AFR closed-loop monitoring without custom sensor harnesses or wire splicing.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2016-2021 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eL15B7 \/ FC1, FC3, FK7\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e174 hp \/ 162 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e18160-5AA-A00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2016-2021 Honda Civic EX 1.5L Turbo\u003c\/li\u003e\n  \u003cli\u003e2016-2021 Honda Civic EX-L 1.5L Turbo\u003c\/li\u003e\n  \u003cli\u003e2016-2021 Honda Civic EX-T 1.5L Turbo\u003c\/li\u003e\n  \u003cli\u003e2016-2021 Honda Civic Touring 1.5L Turbo\u003c\/li\u003e\n  \u003cli\u003e2017-2021 Honda Civic Sport \/ Sport Touring 1.5L Turbo\u003c\/li\u003e\n  \u003cli\u003e2017-2020 Honda Civic Si 1.5L Turbo\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FC1\/FK7 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2016-2021 Honda Civic equipped with the L15B7 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve a P0420 catalytic converter code?\u003c\/strong\u003e\u003cbr\u003e Yes, replacing an inefficient or melted factory core with this functional ceramic substrate restores catalyst efficiency within ECU-monitored thresholds.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Tuner Standard\u003c\/h3\u003e\n\u003cp\u003eDesigned to preserve the rev-happy characteristics of Honda's VTEC turbo platforms, this assembly balances low-restriction exhaust scavenging with factory emissions reliability, keeping spool response immediate and your dashboard warning-free.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501698945272,"sku":"DS-E0NW54DW9","price":182.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2016-2021-1-5l-front-1.jpg?v=1789329712"},{"product_id":"catalytic-converter-for-honda-civic-2016-2021-2-0l-front","title":"Catalytic Converter for Honda Civic (2016-2021) 2.0L Front","description":"\u003ch2\u003eDirect-Fit Front Catalytic Converter for 2016-2021 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The front catalytic converter replaces the clogged or degraded factory emissions unit on the 2016-2021 Honda Civic 2.0L to restore proper exhaust gas scavenging, eliminate P0420 fault codes, and maintain legal tailpipe emissions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Catalyst Breakdown\u003c\/h3\u003e\n\u003cp\u003eThe factory catalytic converter on the \u003cstrong\u003eFC\u003c\/strong\u003e chassis paired with the naturally aspirated \u003cstrong\u003eK20C2\u003c\/strong\u003e engine undergoes severe thermal cycling in the forward manifold position. Over extended mileage, thermal fatigue degrades the precious metal washcoat, causing washcoat sintering, internal ceramic substrate fracturing, and cell collapse. This mechanical restriction chokes off exhaust scavenging velocity, increasing backpressure at the cylinder head, diminishing volumetric efficiency, and triggering persistent downstream oxygen sensor check engine lights.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed from high-grade stainless steel, this direct-fit catalytic converter assembly features a heavy-duty ceramic honeycomb monolith with high-density cell geometry to optimize surface contact without choking exhaust flow. Precision-machined, thick flanges eliminate thermal warping and exhaust blow-by, while factory-located O2 sensor bungs retain stock sensor harnesses without wire splicing. The assembly directly integrates with the factory header and mid-pipe mounting locations, providing long-term structural integrity and compliance with Federal EPA emissions standards.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2016-2021 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eK20C2 \/ FC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e158 hp \/ 138 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2016 Honda Civic 2.0L (Front)\u003c\/li\u003e\n  \u003cli\u003e2017 Honda Civic 2.0L (Front)\u003c\/li\u003e\n  \u003cli\u003e2018 Honda Civic 2.0L (Front)\u003c\/li\u003e\n  \u003cli\u003e2019 Honda Civic 2.0L (Front)\u003c\/li\u003e\n  \u003cli\u003e2020 Honda Civic 2.0L (Front)\u003c\/li\u003e\n  \u003cli\u003e2021 Honda Civic 2.0L (Front)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FC Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2016-2021 Honda Civic equipped with the K20C2 2.0L naturally aspirated engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve a P0420 catalytic efficiency diagnostic trouble code?\u003c\/strong\u003e\u003cbr\u003e Yes, it restores required catalytic oxidation-reduction capacity to keep emissions within threshold and clear P0420 codes provided upstream air-fuel mixtures are correct.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Precision Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to match Japanese OEM tolerances, this replacement converter ensures precise runner alignment, factory thermal clearance, and zero exhaust resonance under load.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501703500024,"sku":"DS-ELDVBE3UA","price":187.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2016-2021-2-0l-front-1.jpg?v=1789329902"},{"product_id":"catalytic-converter-for-honda-civic-2014-2015-1-8l-front","title":"Catalytic Converter for Honda Civic (2014-2015) 1.8L Front","description":"\u003ch2\u003eDirect-Fit Stainless Front Catalytic Converter for 2014-2015 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Front Catalytic Converter replaces the degraded factory manifold catalyst on the 2014-2015 Honda Civic to restore proper exhaust gas scavenging, eliminate P0420 trouble codes, and ensure reliable tailpipe emissions compliance.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Catalyst Degradation and Exhaust Restriction\u003c\/h3\u003e\n\u003cp\u003eOver extended operating cycles, factory catalytic converters on the ninth-generation Civic suffer from ceramic core thermal fatigue and oil-vapor washcoat fouling. Exhaust temperatures at the cylinder head outlet cause the stock internal washcoat to sinter, drastically reducing oxygen storage capacity and triggering persistent \u003cstrong\u003eP0420\u003c\/strong\u003e diagnostic trouble codes. Furthermore, physical degradation of the factory ceramic cell matrix leads to core crumbling and increased exhaust backpressure, which chokes exhaust velocity, bogs down engine response, and robs power during high-RPM valve timing transitions.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis front catalytic converter assembly is precision-fabricated with heavy-gauge stainless steel tubing and durable robotic welds to withstand severe thermal expansion cycles. Internally, a high-flow ceramic honeycomb substrate coated with an optimized precious-metal loading ensures maximum hydrocarbon and NOx conversion efficiency while minimizing backpressure. CNC-machined mating flanges provide a leak-free seal against the cylinder head and downpipe, maintaining factory sensor depths for accurate upstream and downstream oxygen sensor telemetry without requiring ECU re-tunes or custom exhaust fabrication.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2014-2015 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eR18Z1\u003c\/strong\u003e \/ \u003cstrong\u003eFB2\u003c\/strong\u003e (Sedan), \u003cstrong\u003eFG1\u003c\/strong\u003e (Coupe)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e143 hp \/ 129 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2014-2015 Honda Civic LX (1.8L L4 - \u003cstrong\u003eR18Z1\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2014-2015 Honda Civic EX (1.8L L4 - \u003cstrong\u003eR18Z1\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2014-2015 Honda Civic EX-L (1.8L L4 - \u003cstrong\u003eR18Z1\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2014-2015 Honda Civic HF (1.8L L4 - \u003cstrong\u003eR18Z1\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FB2 and FG1 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this assembly is an exact direct-fit replacement for 2014-2015 Honda Civic models equipped with the 1.8L \u003cstrong\u003eR18Z1\u003c\/strong\u003e engine in the front manifold location.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill this resolve an active P0420 DTC code?\u003c\/strong\u003e\u003cbr\u003e Yes, providing fuel trim and O2 sensor circuits operate properly, this high-efficiency converter restores the required chemical conversion window to clear catalyst efficiency codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Tuning Standard\u003c\/h3\u003e\n\u003cp\u003eEngineered to complement the rev-happy nature of the Honda \u003cstrong\u003eR18Z1\u003c\/strong\u003e powertrain, this emissions assembly maintains crisp exhaust scavenging, preserves smooth power delivery across the rev range, and eliminates unwanted exhaust rasp while meeting rigorous EPA operational standards.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50501711790328,"sku":"DS-EW7GC9JXI","price":197.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catalytic-converter-for-honda-civic-2014-2015-1-8l-front-1.jpg?v=1789330395"},{"product_id":"catback-exhaust-for-honda-civic-2001-2005-1-7l","title":"Catback Exhaust for Honda Civic (2001-2005) 1.7L","description":"\u003ch2\u003eHigh-Flow Catback Exhaust for 2001-2005 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Catback Exhaust for Honda Civic (2001-2005) 1.7L replaces the restrictive factory exhaust piping and baffled muffler downstream of the catalytic converter to reduce backpressure, accelerate exhaust gas velocity, and deliver a clean, aggressive exhaust note.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Flow Restriction and Corrosion Risks\u003c\/h3\u003e\n\u003cp\u003eFrom the factory, the 7th generation Civic is choked by narrow-diameter, crush-bent aluminized steel tubing. Crush bending inherently pinches the pipe at each radius, creating sharp turbulence zones and localized thermal bottlenecks that restrict the scavenge effect during the exhaust cycle. Over extended thermal cycles, the OEM mild steel casing is highly susceptible to road salt oxidation and weld fatigue at the flange joints. Furthermore, the heavily baffled internal chambers of the stock muffler generate excessive backpressure, preventing the \u003cstrong\u003eD17A2\u003c\/strong\u003e and \u003cstrong\u003eD17A1\u003c\/strong\u003e engines from expelling spent gasses efficiently at higher RPM thresholds.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis cat-back system replaces the OEM layout with high-grade, corrosion-resistant \u003cstrong\u003eT-304 stainless steel\u003c\/strong\u003e. Constructed with smooth, mandrel-bent tubing, the pipe maintains a uniform cross-sectional diameter through every contour to ensure laminar flow and optimize exhaust gas velocity. Precision TIG welds ensure structural integrity under sustained vibration and heat cycling. Designed as a direct bolt-on replacement for the \u003cstrong\u003eEM2\u003c\/strong\u003e coupe and \u003cstrong\u003eES1\u003c\/strong\u003e sedan chassis, this system integrates pre-welded OE-style hangers, precision-cut heavy-duty flanges, and low-restriction straight-through muffler internals designed to minimize parasitic pumping losses without introducing excessive low-RPM drone.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2001-2005 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eD17 (D17A2 \/ D17A1) \/ EM2, ES1\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e127 hp \/ 114 lb-ft (EX)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2001-2005 Honda Civic EX 1.7L (Coupe \/ Sedan)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the EM2 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2001-2005 Honda Civic equipped with the D17A2 1.7L engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill installing this catback exhaust trigger a Check Engine Light (CEL)?\u003c\/strong\u003e\u003cbr\u003e No, because this system bolts on downstream of the catalytic converter, it does not alter secondary O2 sensor readings or disrupt factory emissions diagnostics.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Tuning Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the dedicated JDM tuner, this system optimizes backpressure parameters to sharpen throttle response, pull cleanly into the upper powerband, and generate a deep, resonant tone free of raspy distortion.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50512342778104,"sku":"DS-EKTLE5DP6","price":177.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catback-exhaust-for-honda-civic-2001-2005-1-7l-1.jpg?v=1789425686"},{"product_id":"catback-exhaust-for-honda-civic-1988-1991","title":"Catback Exhaust for Honda Civic (1988-1991)","description":"\u003ch2\u003eHigh-Flow Stainless Steel Catback Exhaust for 1988-1991 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The direct-fit catback exhaust system replaces the restrictive, corrosion-prone factory exhaust on the 1988-1991 Honda Civic hatchback to lower exhaust backpressure, optimize gas velocity, and enhance overall engine efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Exhaust Restriction and Corrosion Bottlenecks\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust assemblies on the fourth-generation \u003cstrong\u003eED\/EF Chassis\u003c\/strong\u003e Civics utilize narrow, sub-2.0-inch aluminized mild steel piping prone to severe rust perforation and internal baffle deterioration over time. Additionally, OEM manufacturing relied on standard press-crush bending, introducing tight choke points that disrupt continuous exhaust scavenging. This restricted flow increases thermal buildup and exhaust backpressure, choking top-end volumetric efficiency on naturally aspirated \u003cstrong\u003eD-Series\u003c\/strong\u003e powerplants.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed from mandrel-bent stainless steel, this performance catback system features a 63mm (2.5-inch) continuous-diameter layout designed to eliminate internal flow separation and maintain laminar gas velocity. Precision TIG-welded flanges and pre-positioned factory-style mounting hangers allow direct bolt-on installation to factory rubber isolators. Fitted with a straight-through, sound-absorbing performance muffler and a 4.5-inch polished tip, it reduces parasitic backpressure and smooths out exhaust pulses while providing a crisp, resonant tone without excessive low-RPM cabin drone.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e1988-1991 Honda Civic (3-Door Hatchback)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eD15B2\u003c\/strong\u003e, \u003cstrong\u003eD16A6\u003c\/strong\u003e (\u003cstrong\u003eD-Series\u003c\/strong\u003e) \/ \u003cstrong\u003eED6\u003c\/strong\u003e, \u003cstrong\u003eED7\u003c\/strong\u003e (\u003cstrong\u003eEF Chassis\u003c\/strong\u003e)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e92–108 hp \/ 89–100 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1988-1991 Honda Civic Base 3-Door Hatchback (1.5L L4 \u003cstrong\u003eD15B2\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e1988-1991 Honda Civic DX 3-Door Hatchback (1.5L L4 \u003cstrong\u003eD15B2\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e1988-1991 Honda Civic Si 3-Door Hatchback (1.6L L4 \u003cstrong\u003eD16A6\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the ED\/EF Chassis Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 1988-1991 Honda Civic 3-door hatchback equipped with the \u003cstrong\u003eD-Series\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this system bolt directly to the factory catalytic converter?\u003c\/strong\u003e\u003cbr\u003e Yes, the 2-bolt inlet flange is engineered to match the OEM catalytic converter layout for a straightforward bolt-on fitment.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Performance Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered to complement high-revving naturally aspirated JDM platforms, this cat-back exhaust system unlocks true exhaust flow potential, ensuring sharp throttle response and a distinct, deep exhaust profile built to withstand hard street and track use.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50512352903416,"sku":"DS-E8DAKQWJD","price":278.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/catback-exhaust-for-honda-civic-1988-1991-1.jpg?v=1789426038"},{"product_id":"cat-back-exhaust-for-honda-civic-si-2007-2011-2-0l","title":"Cat Back Exhaust for Honda Civic Si (2007-2011) 2.0L","description":"\u003ch2\u003eHigh-Flow T-304 Stainless Steel Cat Back Exhaust for 2007-2011 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The cat-back exhaust system replaces the restrictive factory exhaust on the 2007-2011 Honda Civic Si to reduce backpressure, accelerate exhaust scavenging, and optimize high-RPM gas velocity.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic High-RPM Flow Bottleneck\u003c\/h3\u003e\n\u003cp\u003eFrom the factory, the 8th generation Civic Si exhaust relies on narrow, press-bent tubing and a heavily baffled chambered muffler to minimize sound levels. While effective at dampening NVH, these tight bend reductions impede exhaust gas velocity precisely when the high-revving \u003cstrong\u003eK20Z3\u003c\/strong\u003e engine engages its VTEC crossover above 5,800 RPM. The resulting thermodynamic bottleneck creates parasitic backpressure upstream at the header, raising cylinder temperatures and choking off peak volumetric efficiency.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-fit cat-back system replaces the OEM restriction with continuous 2.25-inch mandrel-bent \u003cstrong\u003eT-304 stainless steel\u003c\/strong\u003e piping terminating in a 4.5-inch polished tip. Mandrel bending preserves a uniform cross-sectional diameter across all bends, eliminating flow turbulence and maximizing kinetic exhaust scavenging. Pre-welded, heavy-duty hangers integrate seamlessly with OEM rubber isolators for a secure bolt-on install. The straight-through, low-restriction muffler reduces exhaust gas temperatures (EGTs) and provides complete corrosion resistance under intense heat cycles.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2007-2011 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eK20Z3\u003c\/strong\u003e \/ \u003cstrong\u003eFG2\u003c\/strong\u003e (Coupe), \u003cstrong\u003eFA5\u003c\/strong\u003e (Sedan)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e197 hp \/ 139 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2007-2011 Honda Civic Si Coupe 2.0L (FG2)\u003c\/li\u003e\n  \u003cli\u003e2007-2011 Honda Civic Si Sedan 2.0L (FA5)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FG2 and FA5 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2007-2011 Honda Civic equipped with the K20Z3 engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill installing this cat-back trigger a Check Engine Light (CEL)?\u003c\/strong\u003e\u003cbr\u003e No, this system bolts downstream of the factory catalytic converter, leaving all factory O2 sensor feedback loops untouched.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda JDM Power Caliber\u003c\/h3\u003e\n\u003cp\u003eEngineered specifically for high-RPM naturally aspirated VTEC dynamics, this exhaust delivers rapid cylinder evacuation and a refined, deep tone without mid-range torque loss.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50622353080568,"sku":"DS-E38841GPA","price":479.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/cat-back-exhaust-for-honda-civic-si-2007-2011-2-0l-1.jpg?v=1790263468"},{"product_id":"cat-back-exhaust-for-honda-civic-2006-2011-1-8l","title":"Cat Back Exhaust for Honda Civic (2006-2011) 1.8L","description":"\u003ch2\u003eHigh-Flow Cat Back Exhaust for 2006-2011 Honda Civic\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Cat Back Exhaust replaces the restrictive factory exhaust assembly on the 2006-2011 Honda Civic 1.8L to decrease backpressure, enhance exhaust scavenging, and improve engine breathing.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Honda Civic Exhaust Restriction and Corrosion Issues\u003c\/h3\u003e\n\u003cp\u003eThe factory exhaust on the 8th generation Civic utilizes narrow-diameter, press-bent mild steel tubing that pinches flow at every bend radius. Internally, the OEM muffler relies on multi-chamber baffles that introduce extreme turbulence and thermal retention, choking flow from the \u003cstrong\u003eR18A1\u003c\/strong\u003e cylinder head. Over time, the low-grade factory aluminized steel suffers from galvanic corrosion and weld decay at the flange joints, leading to parasitic leaks and compromised exhaust gas velocity.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis direct-replacement cat-back system utilizes mandrel-bent \u003cstrong\u003eT304 stainless steel\u003c\/strong\u003e tubing to maintain a consistent cross-sectional diameter throughout the entire routing. CNC-machined flanges mate cleanly with OEM mounting points and catalytic converter exits, preventing blowouts. The straight-through, perforated-core resonator and muffler design eliminates internal backpressure spikes without introducing high-RPM drone. By accelerating exhaust gas velocity away from the exhaust ports, this system promotes more efficient cylinder evacuation during valve overlap on the naturally aspirated SOHC i-VTEC platform.\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; margin-bottom: 20px;\"\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2006-2011 Honda Civic\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eR18A1\u003c\/strong\u003e \/ \u003cstrong\u003eFA1\u003c\/strong\u003e (Sedan), \u003cstrong\u003eFG1\u003c\/strong\u003e (Coupe)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e140 hp \/ 128 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006-2011 Honda Civic DX (1.8L L4 - \u003cstrong\u003eFA1\u003c\/strong\u003e \/ \u003cstrong\u003eFG1\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2006-2011 Honda Civic LX (1.8L L4 - \u003cstrong\u003eFA1\u003c\/strong\u003e \/ \u003cstrong\u003eFG1\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2006-2011 Honda Civic EX (1.8L L4 - \u003cstrong\u003eFA1\u003c\/strong\u003e \/ \u003cstrong\u003eFG1\u003c\/strong\u003e)\u003c\/li\u003e\n  \u003cli\u003e2009-2011 Honda Civic LX-S (1.8L L4 - \u003cstrong\u003eFA1\u003c\/strong\u003e)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eDoes this fit the FA1 and FG1 Civic?\u003c\/strong\u003e\u003cbr\u003e Yes, this is a direct fit for the 2006-2011 Honda Civic equipped with the \u003cstrong\u003eR18A1\u003c\/strong\u003e engine.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWill installing this cat-back trigger a Check Engine Light (CEL)?\u003c\/strong\u003e\u003cbr\u003e No, because this system bolts downstream of all primary and secondary O2 sensors, it will not disturb emissions readings or trigger diagnostic trouble codes.\u003c\/p\u003e\n\n\u003ch3\u003eThe Honda Acoustic and Flow Standard\u003c\/h3\u003e\n\u003cp\u003eBuilt for the high-revving demands of Honda's legendary valvetrain engineering, this cat-back delivers clean flow dynamics, razor-sharp throttle response, and a deep exhaust note without sacrificing daily-driver cabin acoustics.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":50622416781560,"sku":"DS-EMJ3XZX89","price":247.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/cat-back-exhaust-for-honda-civic-2006-2011-1-8l-1.jpg?v=1790264709"}],"url":"https:\/\/performancechiptuning.com\/collections\/honda-civic-exhaust.oembed","provider":"Performance Chip Tuning","version":"1.0","type":"link"}