{"product":{"id":11350220767574,"title":"Kooks Shelby GT500 5.2L Header and Connection Kits (2020-2022)","body_html":"\u003ch2\u003eBuild an exhaust upgrade around your supercharged GT500\u003c\/h2\u003e\u003cp\u003eGive your Predator-powered GT500 a matched Kooks long tube header and front connection upgrade. All three packages use 2\" headers, with Competition Only, GREEN or H.O. GREEN connections. The kits include OEM adapters, allowing the factory-style rear exhaust to remain part of the setup.\u003c\/p\u003e\u003cp\u003eSKUs: 1156H610, 1156H630, 1156H640\u003c\/p\u003e\u003ch2\u003eChoose the catalyst specification\u003c\/h2\u003e\u003cp\u003eGREEN and H.O. GREEN give you two catted choices for this supercharged engine. The H.O. GREEN package uses 4-1\/2\" catalyst bodies and a 300 CPSI substrate. Competition Only supplies uncatted front connections for competition use.\u003c\/p\u003e\u003ch2\u003eThe adapters and fitting parts are part of the kit\u003c\/h2\u003e\u003cp\u003eThe 2\" headers use 3\" collectors. O2 extensions, gaskets and installation hardware are included; the H.O. GREEN package expressly specifies 3\" to 2-3\/4\" OEM adapters. That gives you a clearer complete purchase than buying headers without their front connections.\u003c\/p\u003e\u003ch2\u003eChoose your configuration\u003c\/h2\u003e\u003cdiv class=\"table-scroll\"\u003e\u003ctable class=\"variant-comparison\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eConfiguration\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eSupplied arrangement\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eFitting \/ engine conditions\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e1156H610\u003c\/td\u003e\n\u003ctd\u003eCat Type: Comp. Only\u003c\/td\u003e\n\u003ctd\u003eHeaders; Competition Only front connections; OEM adapters, O2 extensions, gaskets and installation hardware included\u003c\/td\u003e\n\u003ctd\u003eUncatted; competition use\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1156H630\u003c\/td\u003e\n\u003ctd\u003eCat Type: GREEN Cats\u003c\/td\u003e\n\u003ctd\u003eHeaders; GREEN Cats front connections; OEM adapters, O2 extensions, gaskets and installation hardware included\u003c\/td\u003e\n\u003ctd\u003eUse the SKU-specific vehicle rows below\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e1156H640\u003c\/td\u003e\n\u003ctd\u003eCat Type: H.O. GREEN Cats\u003c\/td\u003e\n\u003ctd\u003eHeaders; H.O. GREEN cats front connections; OEM adapters, O2 extensions, gaskets and installation hardware included\u003c\/td\u003e\n\u003ctd\u003eUse the SKU-specific vehicle rows below\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\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\u003e2020-2022\u003c\/td\u003e\n\u003ctd\u003eFord Mustang Shelby GT500\u003c\/td\u003e\n\u003ctd\u003e5.2L V8\u003c\/td\u003e\n\u003ctd\u003e1156H610, 1156H630, 1156H640\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\u003eSKUs\u003c\/td\u003e\n\u003ctd\u003e1156H610, 1156H630, 1156H640\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003e2020-2022 Shelby GT500 5.2L supercharged V8\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\u003e2\" primaries; 3\" collectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eChoices\u003c\/td\u003e\n\u003ctd\u003eCompetition Only, GREEN or H.O. GREEN\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM adapters\u003c\/td\u003e\n\u003ctd\u003eIncluded; H.O. GREEN kit specifies 3\" to 2-3\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitting parts\u003c\/td\u003e\n\u003ctd\u003eO2 extensions, gaskets and installation hardware\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eH.O. GREEN substrate\u003c\/td\u003e\n\u003ctd\u003e300 CPSI in 4-1\/2\" bodies\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\u003eDo I need to buy OEM adapters separately?\u003c\/h3\u003e\u003cp\u003eThe kits include OEM adapters. The H.O. GREEN package specifies the 3\" to 2-3\/4\" transition.\u003c\/p\u003e\u003ch3\u003eIs this for the earlier 5.4 or 5.8 GT500?\u003c\/h3\u003e\u003cp\u003eThis page is the supercharged 5.2-litre GT500 package. Earlier GT500 generations have different kits.\u003c\/p\u003e\u003ch2\u003eIntended use\u003c\/h2\u003e\u003cp\u003e1156H610: Competition, off-road and track use only. Not for use on public roads.\u003c\/p\u003e\u003cp\u003eThe competition-use waiver applies to 1156H610.\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":"2026-10-08T10:41:58+01:00","handle":"kooks-2020-2022-shelby-gt500-5-2l-header-conn-kits","updated_at":"2026-10-10T21:30:24+01:00","published_at":"2026-10-09T13:35:09+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, dept:performance-parts, fits:ford-mustang, make:ford, type:header-kit","variants":[{"id":55646916641110,"product_id":11350220767574,"title":"Comp. Only","price":"2631.91","sku":"1156H610","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Comp. Only","option2":null,"option3":null,"created_at":"2026-10-08T10:41:58+01:00","updated_at":"2026-10-10T21:30:24+01:00","taxable":true,"barcode":"842422175740","grams":21772,"image_id":null,"weight":21.772,"weight_unit":"kg","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"GBP","compare_at_price_currency":"","quantity_price_breaks":[]},{"id":55646916673878,"product_id":11350220767574,"title":"GREEN Cats","price":"3483.89","sku":"1156H630","position":2,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"GREEN Cats","option2":null,"option3":null,"created_at":"2026-10-08T10:41:58+01:00","updated_at":"2026-10-10T21:30:24+01:00","taxable":true,"barcode":"842422175757","grams":21772,"image_id":null,"weight":21.772,"weight_unit":"kg","requires_shipping":true,"quantity_rule":{"min":1,"max":null,"increment":1},"price_currency":"GBP","compare_at_price_currency":"","quantity_price_breaks":[]},{"id":55646916706646,"product_id":11350220767574,"title":"H.O. GREEN Cats","price":"4004.54","sku":"1156H640","position":3,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"H.O. GREEN Cats","option2":null,"option3":null,"created_at":"2026-10-08T10:41:58+01:00","updated_at":"2026-10-10T21:30:24+01:00","taxable":true,"barcode":"842422180218","grams":23133,"image_id":null,"weight":23.133,"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":14512405119318,"product_id":11350220767574,"name":"Cat Type","position":1,"values":["Comp. Only","GREEN Cats","H.O. 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