{"product_id":"stainless-steel-exhaust-header-for-subaru-impreza-wrx-2006-2007-wrx-sti-2004-2007-2-5l","title":"Stainless Steel Exhaust Header for Subaru Impreza WRX (2006-2007) \u0026 WRX STI (2004-2007) 2.5L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHigh-Flow Stainless Steel Exhaust Header for 2006-2007 Subaru WRX,WRX STI (GD\/GG)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Stainless Steel Exhaust Header replaces the restrictive factory cast iron manifold on 2006-2007 Subaru WRX and WRX STI models to decrease backpressure, accelerate turbo spool, and enhance cylinder scavenging.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Subaru WRX,WRX STI Exhaust Manifold Restriction\u003c\/h3\u003e\n\u003cp\u003eFactory exhaust manifolds installed on the \u003cstrong\u003eEJ255\u003c\/strong\u003e and \u003cstrong\u003eEJ257\u003c\/strong\u003e boxer engines utilize heavy cast iron runners with rough internal casting flash and inefficient merge junctions. This rough internal surface creates boundary layer drag and turbulence right at the exhaust ports. Furthermore, the OEM manifold's restrictive collector design retains excessive thermal energy near the cylinder heads, worsening heat soak and generating high pre-turbine backpressure that dampens transient throttle response and delays boost threshold.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eConstructed from mandrel-bent \u003cstrong\u003eT-304 stainless steel\u003c\/strong\u003e, this tubular performance manifold eliminates flow bottlenecks with 1.5-inch primary runners routing smoothly into a 2.0-inch collector. The tuned geometry synchronizes exhaust pulse scavenging, lowering pumping losses and driving exhaust gases directly into the up-pipe via a rigid 4-bolt flange. Precision CNC-machined, warp-resistant thick flanges deliver a reliable high-temperature seal against the boxer cylinder heads, while the corrosion-resistant polished finish withstands aggressive thermal expansion cycles without structural fatigue.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 Exhaust Header\u003c\/li\u003e\n  \u003cli\u003e3 Gaskets\u003c\/li\u003e\n  \u003cli\u003eMounting Bolts and Nuts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\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;\"\u003e2006-2007 Subaru WRX,WRX STI\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;\"\u003eEJ255, EJ257 \/ GD, GG\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;\"\u003e230-293 hp \/ 235-290 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\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2006-2007 Subaru Impreza WRX 2.5L EJ255 Turbo\u003c\/li\u003e\n  \u003cli\u003e2004-2007 Subaru Impreza WRX STI 2.5L EJ257 Turbo\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the GD\/GG WRX,WRX STI?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2006-2007 Subaru WRX,WRX STI equipped with the \u003cstrong\u003eEJ255\u003c\/strong\u003e and \u003cstrong\u003eEJ257\u003c\/strong\u003e engine; it is not compatible with naturally aspirated 2.5L Impreza models.\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to re-torque the header hardware after installation?\u003c\/h4\u003e\n\u003cp\u003eYes, it is strongly recommended to re-torque all header-to-head and up-pipe flange hardware after the initial heat cycles to prevent exhaust leaks caused by metal thermal expansion.\u003c\/p\u003e\n\n\u003ch3\u003eThe Subaru Boxer Caliber\u003c\/h3\u003e\n\u003cp\u003eMaximize the unmistakable boxer exhaust note and free up high-RPM power with high-velocity primary tubing designed for rugged durability under extreme boost levels.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67896014668024,"sku":"DS-E07OWW502","price":156.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/stainless-steel-exhaust-header-for-subaru-impreza-wrx-2006-2007-wrx-sti-2004-2007-2-5l-1.jpg?v=1793290949","url":"https:\/\/performancechiptuning.com\/es\/products\/stainless-steel-exhaust-header-for-subaru-impreza-wrx-2006-2007-wrx-sti-2004-2007-2-5l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}