{"product_id":"iag-performance-equal-length-3-bolt-header-uppipe-for-02-14-wrx-04-21-sti-05-09-lgt-04-08-fxt","title":"IAG Equal Length 3-Bolt Header \u0026 Uppipe 02-14 WRX \/ 04-21 STI \/ 05-09 Legacy GT \/ 04-08 Forester XT","description":"\u003ch3\u003eIAG Equal Length 3-Bolt Header \u0026amp; Uppipe 02-14 WRX \/ 04-21 STI \/ 05-09 Legacy GT \/ 04-08 Forester XT | 304 Stainless Steel | Performance Exhaust Header \u0026amp; Uppipe\u003c\/h3\u003e\n\n\u003ch4\u003eOverview\u003c\/h4\u003e\n\u003cp\u003eThe IAG Equal Length 3-Bolt Header \u0026amp; Uppipe is a precision-engineered exhaust upgrade designed specifically for Subaru WRX, WRX STI, Legacy GT, and Forester XT models spanning 2002 to 2021. This high-performance header system replaces the restrictive factory manifold with a 4-2-1 equal-length design that optimizes exhaust flow and turbo spool characteristics. Paired with a 3-bolt stainless steel uppipe, this kit ensures a leak-free, durable connection to your turbocharger, making it an ideal choice for enthusiasts seeking improved power delivery and throttle response.\u003c\/p\u003e\n\u003cp\u003eCrafted from premium 304 stainless steel, the IAG header features fully TIG-welded construction and cast stainless flanges for exceptional strength and longevity under extreme heat cycling. The 45mm pipe diameter and slip-joint expansion section accommodate thermal expansion while maintaining structural integrity. IAG’s engineering focus on equal-length tubing and a merged collector design reduces turbo lag by approximately 300 RPM, delivering smoother and more consistent power across the entire RPM range.\u003c\/p\u003e\n\u003cp\u003eSubaru owners will appreciate the tangible performance gains and refined exhaust tone this header system provides. The equal-length design shifts the exhaust note away from the traditional boxer rumble to a smoother, more aggressive sound that complements the sporty character of these platforms. Whether you’re building a street performance car or a track-focused machine, this header and uppipe combination is a foundational upgrade that supports further tuning and modifications.\u003c\/p\u003e\n\n\u003ch4\u003eFeatures \u0026amp; Specifications\u003c\/h4\u003e\n\u003cp\u003eThis IAG Performance Equal Length Header \u0026amp; Uppipe is engineered for Subaru WRX, WRX STI, Legacy GT, and Forester XT models and features a 45mm pipe diameter with a 4-2-1 equal-length design. Constructed from 304 stainless steel with cast stainless flanges and TIG welding, it delivers improved turbo spool and exhaust flow for Subaru enthusiasts seeking enhanced power and reliability.\u003c\/p\u003e\n\u003cul style=\"list-style:none;padding:0;margin:0;\"\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e IAG Performance\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProduct:\u003c\/strong\u003e Equal Length 3-Bolt Header \u0026amp; Uppipe\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e IAG-EXT-1001\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e 2002-2014 WRX, 2004-2021 STI, 2005-2009 Legacy GT, 2004-2008 Forester XT\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e 304 Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Natural Stainless Steel\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConstruction:\u003c\/strong\u003e Fully TIG Welded with Cast Stainless Flanges\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOrigin:\u003c\/strong\u003e Not Specified\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePipe Diameter:\u003c\/strong\u003e 45mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e 4-2-1 Equal Length Header with Merged Collector\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUppipe Connection:\u003c\/strong\u003e 3-Bolt Cast Flange with Multi-Layer Gasket\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExpansion Joint:\u003c\/strong\u003e Slip-Joint for Heat Cycling Flex\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Gains:\u003c\/strong\u003e Turbo spool improved by approximately 300 RPM\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTuning Required:\u003c\/strong\u003e Recommended for optimal performance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eKey Benefits\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePerformance:\u003c\/strong\u003e Improves turbo spool by 300 RPM, enhancing throttle response and mid-range power delivery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDurability:\u003c\/strong\u003e 304 stainless steel construction with TIG welding and cast flanges ensures long-lasting strength under heat stress.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Designed specifically for multiple Subaru platforms with a 3-bolt flange for a secure, leak-free connection.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eExhaust Flow:\u003c\/strong\u003e Equal length 4-2-1 design optimizes scavenging and reduces backpressure across the RPM range.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSound Quality:\u003c\/strong\u003e Alters exhaust tone from boxer rumble to a smoother, more refined note without sacrificing character.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eInstallation:\u003c\/strong\u003e Includes all necessary hardware and multi-layer gaskets for a complete upgrade.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1× IAG Equal Length Stainless Steel Header\u003c\/li\u003e\n  \u003cli\u003e1× IAG 3-Bolt Stainless Steel Uppipe\u003c\/li\u003e\n  \u003cli\u003e1× 3-Bolt Uppipe Gasket\u003c\/li\u003e\n  \u003cli\u003e3× Uppipe to Manifold Zinc Plated Bolts and Nuts\u003c\/li\u003e\n  \u003cli\u003e5× Uppipe to Turbo Threaded Studs\u003c\/li\u003e\n  \u003cli\u003e1× EGT Plug\u003c\/li\u003e\n  \u003cli\u003e6× Copper Flange Nuts (Manifold to Head)\u003c\/li\u003e\n  \u003cli\u003e2× Manifold to Cylinder Head Gaskets\u003c\/li\u003e\n  \u003cli\u003e1× Uppipe to Turbo Gasket\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eInstallation \u0026amp; Compatibility\u003c\/h4\u003e\n\u003cp\u003eInstallation of the IAG Equal Length Header \u0026amp; Uppipe requires moderate mechanical skill and basic hand tools. While the kit includes all necessary hardware and gaskets, professional installation is recommended to ensure proper torque settings and leak-free sealing, especially given the critical nature of exhaust flange connections. The slip-joint expansion section accommodates thermal expansion, reducing stress on the exhaust system during heat cycles. Tuning is recommended after installation to optimize air\/fuel ratios and maximize power gains.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eProfessional Installation:\u003c\/strong\u003e Recommended\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eModifications Required:\u003c\/strong\u003e None; direct bolt-on fitment\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVerify Compatibility:\u003c\/strong\u003e Confirm fitment for your specific year and trim level within the supported range\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eShop with confidence at Subimods—your Subaru parts specialists.\u003c\/p\u003e","brand":"IAG Performance","offers":[{"title":"Default Title","offer_id":47109046698159,"sku":"IAG-EXT-1001","price":899.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0587\/3598\/4815\/files\/iag-equal-length-3-bolt-header-uppipe-02-14-wrx-04-21-sti-05-09-legacy-gt-04-08-forester-xt-iag-ext-1001-5740253.jpg?v=1782324731","url":"https:\/\/subimods.com\/products\/iag-performance-equal-length-3-bolt-header-uppipe-for-02-14-wrx-04-21-sti-05-09-lgt-04-08-fxt","provider":"Subimods.com","version":"1.0","type":"link"}