{"product":{"id":11350218965334,"title":"Kooks Pontiac GTO LS1 Header Kit (2004) | 2411H420","body_html":"\u003ch2\u003eGive your LS1 GTO a matched Kooks exhaust upgrade\u003c\/h2\u003e\u003cp\u003ePair your 2004 GTO with 1-7\/8\" Kooks long tube headers and Performance-catted front connections. This stainless kit is specified for the 5.7-litre LS1 and joins its 2-1\/2\" OEM rear exhaust interface.\u003c\/p\u003e\u003cp\u003eSKU: 2411H420\u003c\/p\u003e\u003ch2\u003eThe right package for the 2004 car\u003c\/h2\u003e\u003cp\u003eThe 3\" collectors feed matching front pipes with 2-1\/2\" OEM rear outlets. The later 6.0-litre GTO uses a different kit with 3\" rear outlets, so engine and model year matter as much as the header size.\u003c\/p\u003e\u003ch2\u003eA naturally aspirated front conversion\u003c\/h2\u003e\u003cp\u003eHeaders and the Performance-catted connections are supplied together. A compatible rear exhaust can remain in place. The cats suit naturally aspirated engines; choose an appropriate forced-induction catalyst arrangement for a boosted LS1.\u003c\/p\u003e\u003ch2\u003eFitting your exhaust\u003c\/h2\u003e\u003cp\u003eInstallation requires removal of the original driver-side heat shield. The passenger-side shield does not need to be removed.\u003c\/p\u003e\u003ch2\u003eTuning for your exhaust upgrade\u003c\/h2\u003e\u003cp\u003eWe recommend tuning with every header installation so the calibration suits your new headers, complete exhaust and fuel. \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/pages\/contact\"\u003eContact us\u003c\/a\u003e to discuss the right tuning route for your vehicle.\u003c\/p\u003e\u003ch2\u003eVehicle fitment\u003c\/h2\u003e\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"vehicle-fitment\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eYears\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eVehicle \/ trim\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eEngine\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eApplicable SKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eFitting conditions\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003e2004\u003c\/td\u003e\n\u003ctd\u003ePontiac GTO Base\u003c\/td\u003e\n\u003ctd\u003e5.7L V8\u003c\/td\u003e\n\u003ctd\u003e2411H420\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"technical-specifications\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSpecification\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSKU\u003c\/td\u003e\n\u003ctd\u003e2411H420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003e2004 Pontiac GTO LS1 5.7L\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003e304 stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeaders\u003c\/td\u003e\n\u003ctd\u003e1-7\/8\" primaries; 3\" collectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConnections\u003c\/td\u003e\n\u003ctd\u003ePerformance-catted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear outlet\u003c\/td\u003e\n\u003ctd\u003e2-1\/2\" OEM\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCatalyst condition\u003c\/td\u003e\n\u003ctd\u003eNaturally aspirated only\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitting change\u003c\/td\u003e\n\u003ctd\u003eOriginal driver-side heat shield removed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eIs this the kit for a 2005 GTO?\u003c\/h3\u003e\u003cp\u003eChoose the separate LS2 2005-2006 kit for that car.\u003c\/p\u003e\u003ch3\u003eAre front connection pipes included?\u003c\/h3\u003e\u003cp\u003eYes. The Performance-catted connections are supplied with the headers.\u003c\/p\u003e\u003ch2\u003eIntended use\u003c\/h2\u003e\u003cp\u003eCompetition, off-road and track use only. Not for use on public roads.\u003c\/p\u003e\u003ch2\u003eOrdering and delivery\u003c\/h2\u003e\u003cp\u003eEstimated lead time is 4-6 weeks. Delivery may be faster depending on stock levels. Shipping is charged separately.\u003c\/p\u003e","vendor":"Kooks","product_type":"Header Kits","created_at":"2026-10-08T10:41:48+01:00","handle":"kooks-2411h420","updated_at":"2026-10-11T13:05:00+01:00","published_at":"2026-10-09T13:36:19+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, dept:performance-parts, fits:pontiac-gto, make:pontiac, type:header-kit","variants":[{"id":55646911955286,"product_id":11350218965334,"title":"Default Title","price":"2812.29","sku":"2411H420","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-10-08T10:41:48+01:00","updated_at":"2026-10-11T13:05:00+01:00","taxable":true,"barcode":"842422178789","grams":34927,"image_id":null,"weight":34.927,"weight_unit":"kg","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"GBP","compare_at_price_currency":"","quantity_price_breaks":[]}],"options":[{"id":14512403087702,"product_id":11350218965334,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":86449312399702,"product_id":11350218965334,"position":1,"created_at":"2026-10-08T10:41:48+01:00","updated_at":"2026-10-08T10:41:51+01:00","alt":"Kooks 1-7\/8\" Header and Catted Connection Kit. 2004 Pontiac GTO LS1 5.7L.","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/e438ffb42ad74d08c6ccea72b48048e4_ff2da541-8278-4b9b-9dc5-784eb277eb4a.jpg?v=1791452511","variant_ids":[]},{"id":86449312432470,"product_id":11350218965334,"position":2,"created_at":"2026-10-08T10:41:48+01:00","updated_at":"2026-10-08T10:41:51+01:00","alt":"Kooks 1-7\/8\" Header and Catted Connection Kit. 2004 Pontiac GTO LS1 5.7L.","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/fd3290e99c35b6374ccc629e8da56ed2_6630a17b-2771-44b4-b5a2-4b9d8bbcfdad.jpg?v=1791452511","variant_ids":[]}],"image":{"id":86449312399702,"product_id":11350218965334,"position":1,"created_at":"2026-10-08T10:41:48+01:00","updated_at":"2026-10-08T10:41:51+01:00","alt":"Kooks 1-7\/8\" Header and Catted Connection Kit. 2004 Pontiac GTO LS1 5.7L.","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/e438ffb42ad74d08c6ccea72b48048e4_ff2da541-8278-4b9b-9dc5-784eb277eb4a.jpg?v=1791452511","variant_ids":[]}}}