{"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":229.95,"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","url":"https:\/\/performancechiptuning.com\/products\/exhaust-muffler-for-honda-civic-hatchback-1988-1991-1-5l-engine","provider":"Performance Chip Tuning","version":"1.0","type":"link"}