{"product_id":"speed-engineering-2004-2006-pontiac-gto-1-7-8-longtube-headers-ls1-ls2","title":"Speed Engineering 1-7\/8\" Longtube Headers — 2004–2006 Pontiac GTO LS1\/LS2 5.7L\/6.0L | 25-1050","description":"\u003cp\u003eThe factory exhaust manifolds on your GTO are one of the first restrictions holding back your LS1 or LS2. Speed Engineering's 1-7\/8\" longtube headers are a direct-fit, dyno-proven upgrade that frees up exhaust flow, improves throttle response, and delivers over 25 rear-wheel horsepower over stock.\u003c\/p\u003e\n\u003cp\u003eBuilt from 304 natural stainless steel with mandrel-bent primary tubes, CNC-machined port-matched flanges, and full TIG-welded construction.\u003c\/p\u003e\n\u003cblockquote\u003e\n\u003cp\u003e⚠️ \u003cstrong\u003eImportant:\u003c\/strong\u003e Speed Engineering's GTO X-pipe kit is required for proper installation of these headers. The X-pipe is sold separately.\u003c\/p\u003e\n\u003c\/blockquote\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull 1-7\/8\" Port-Matched Primary Tubes\u003c\/strong\u003e — Full-diameter flow from cylinder head to collector for maximum exhaust scavenging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\" Collector\u003c\/strong\u003e — Optimized for strong low-to-mid RPM torque\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMandrel Bent Tubing\u003c\/strong\u003e — Consistent tube diameter through every bend; no crimping, no restriction\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCNC Machined Flanges\u003c\/strong\u003e — Precision fit at the head and collector for a leak-free seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e304 Natural Stainless Steel Construction\u003c\/strong\u003e — Corrosion resistant, heat tolerant, and built to last\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLongtube Header Design\u003c\/strong\u003e — Maximum scavenging efficiency vs. shorty or mid-length headers\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDyno Proven\u003c\/strong\u003e — 25+ RWHP gain on LS1 and LS2 applications\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eCompatible with 5.7L LS1 and 6.0L LS2 Engines\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003cp\u003e\u003cstrong\u003eVehicle Applications:\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003ePontiac GTO — LS1\/LS2\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e2004 Pontiac GTO (RWD) — 5.7L LS1\u003c\/li\u003e\n\u003cli\u003e2005 Pontiac GTO (RWD) — 6.0L LS2\u003c\/li\u003e\n\u003cli\u003e2006 Pontiac GTO (RWD) — 6.0L LS2\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003ch5\u003eHow much horsepower do these headers add to a Pontiac GTO?\u003c\/h5\u003e\u003cp\u003eSpeed Engineering's 1-7\/8\" longtube headers are dyno proven to add over 25 rear-wheel horsepower on LS1 and LS2 equipped 2004–2006 Pontiac GTO applications compared to stock exhaust manifolds.\u003c\/p\u003e\n\u003ch5\u003eDo I need any additional parts to install these headers?\u003c\/h5\u003e\u003cp\u003eYes. Speed Engineering's GTO X-pipe kit is required for proper installation of these headers and is sold separately.\u003c\/p\u003e\n\u003ch5\u003eWhat engines are these headers compatible with?\u003c\/h5\u003e\u003cp\u003eThese headers are compatible with the 5.7L LS1 found in the 2004 GTO and the 6.0L LS2 found in 2005–2006 GTO models.\u003c\/p\u003e\n\u003ch5\u003eWhat size are the primary tubes?\u003c\/h5\u003e\u003cp\u003eThese headers feature full 1-7\/8\" port-matched primary tubes with a 3\" collector.\u003c\/p\u003e\n\u003ch5\u003eWhat material are these headers made from?\u003c\/h5\u003e\u003cp\u003e304 natural stainless steel with full TIG-welded construction and CNC-machined port-matched flanges.\u003c\/p\u003e\n\u003ch5\u003eAre these headers street legal?\u003c\/h5\u003e\u003cp\u003eNo. These are race-only headers intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"How much horsepower do these headers add to a Pontiac GTO?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Speed Engineering's 1-7\/8\\\" longtube headers are dyno proven to add over 25 rear-wheel horsepower on LS1 and LS2 equipped 2004–2006 Pontiac GTO applications compared to stock exhaust manifolds.\"}}, {\"@type\": \"Question\", \"name\": \"Do I need any additional parts to install these headers?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. Speed Engineering's GTO X-pipe kit is required for proper installation of these headers and is sold separately.\"}}, {\"@type\": \"Question\", \"name\": \"What engines are these headers compatible with?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These headers are compatible with the 5.7L LS1 found in the 2004 GTO and the 6.0L LS2 found in 2005–2006 GTO models.\"}}, {\"@type\": \"Question\", \"name\": \"What size are the primary tubes?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"These headers feature full 1-7\/8\\\" port-matched primary tubes with a 3\\\" collector.\"}}, {\"@type\": \"Question\", \"name\": \"What material are these headers made from?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"304 natural stainless steel with full TIG-welded construction and CNC-machined port-matched flanges.\"}}, {\"@type\": \"Question\", \"name\": \"Are these headers street legal?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No. These are race-only headers intended for closed-course competition use only. Installation on a street-driven vehicle may violate the Clean Air Act (42 U.S.C. 7522(a)(3)).\"}}]}\u003c\/script\u003e\n\u003chr\u003e\n\u003cblockquote\u003e\n\u003cp\u003e⚠️ \u003cstrong\u003eRace Use Only:\u003c\/strong\u003e This product is manufactured and sold for installation on vehicles used solely for competition. Once installed, the vehicle may not be used, registered, or licensed for use on a public road or highway. Installation on a street-driven vehicle may violate the Clean Air Act 203(a)(3), 42 U.S.C. 7522(a)(3).\u003c\/p\u003e\n\u003c\/blockquote\u003e","brand":"Speed Engineering","offers":[{"title":"Default Title","offer_id":41231696363568,"sku":"25-1050","price":329.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0586\/9548\/3440\/files\/Speed_Engineering_2004_2006_Pontiac_GTO_1-7_8_Longtube_Headers_LS1_LS2_Engines_25-1050.jpg?v=1762267982","url":"https:\/\/berryperformancesales.com\/products\/speed-engineering-2004-2006-pontiac-gto-1-7-8-longtube-headers-ls1-ls2","provider":"Berry Performance Sales","version":"1.0","type":"link"}