{"product":{"id":11350213919062,"title":"Kooks Hellcat 2-inch H.O. GREEN Header and OEM Connection Kit | 3103H640","body_html":"\u003ch2\u003eUpgrade your Hellcat without giving up the rear exhaust you like\u003c\/h2\u003e\u003cp\u003ePair 2\" Kooks long tube headers with H.O. GREEN catted connections for your supercharged Hellcat. This kit finishes at the 2-3\/4\" OEM rear interface, making it the factory-connection choice alongside the separate full 3\"-outlet package.\u003c\/p\u003e\u003cp\u003eSKU: 3103H640\u003c\/p\u003e\u003ch2\u003eA matched high-output front system\u003c\/h2\u003e\u003cp\u003eThe 2\" primaries lead into 3\" collectors and the supplied H.O. GREEN catted front pipes. The 2-3\/4\" rear outlet lets those parts join the OEM exhaust interface. It is a meaningful upgrade for a car whose engine, headers and catalyst choice should be considered together.\u003c\/p\u003e\u003ch2\u003eChoose the rear outlet before ordering\u003c\/h2\u003e\u003cp\u003e3103H640 is the OEM-outlet kit. If you are using a rear system that needs a full 3\" connection, 3103H641 is the matching alternative. Choosing the correct outlet now keeps the kit suited to the exhaust already on your car.\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\u003eMatching products\u003c\/h2\u003e\u003cp\u003eFor a 2015-2020 Challenger Hellcat, add the \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/products\/kooks-31634220?variant=55646903992662\"\u003eKooks Hellcat cat-back\u003c\/a\u003e if you want to replace the rear system as well. Its 2-3\/4\" inlet matches this OEM-outlet front package.\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\n\u003ctr\u003e\n\u003ctd\u003e2015-2022\u003c\/td\u003e\n\u003ctd\u003eDodge Challenger SRT Hellcat\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018-2022\u003c\/td\u003e\n\u003ctd\u003eDodge Challenger SRT Hellcat Widebody\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2018\u003c\/td\u003e\n\u003ctd\u003eDodge Challenger SRT Demon\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2022\u003c\/td\u003e\n\u003ctd\u003eDodge Challenger SRT Hellcat Redeye Widebody\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019-2022\u003c\/td\u003e\n\u003ctd\u003eDodge Challenger SRT Hellcat Redeye\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2020\u003c\/td\u003e\n\u003ctd\u003eDodge Charger SRT Hellcat\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021-2023\u003c\/td\u003e\n\u003ctd\u003eDodge Charger SRT Hellcat Widebody\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2021-2023\u003c\/td\u003e\n\u003ctd\u003eDodge Charger SRT Hellcat Redeye Widebody\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e3103H640\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\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\u003e3103H640\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eCharger \/ Challenger Hellcat 6.2L\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\u003eConnections\u003c\/td\u003e\n\u003ctd\u003eH.O. GREEN catted\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear outlet\u003c\/td\u003e\n\u003ctd\u003e2-3\/4\" OEM interface\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\u003eHow is it different from 3103H641?\u003c\/h3\u003e\u003cp\u003eThis kit uses the 2-3\/4\" OEM rear outlet. 3103H641 has a full 3\" outlet for a matching aftermarket rear system.\u003c\/p\u003e\u003ch3\u003eDoes the price include the front cats?\u003c\/h3\u003e\u003cp\u003eThe H.O. GREEN catted connection pipes are part of the kit.\u003c\/p\u003e\u003ch3\u003eDo you recommend tuning with these headers?\u003c\/h3\u003e\u003cp\u003eWe recommend tuning with every header installation. \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/pages\/contact\"\u003eTalk to us\u003c\/a\u003e about calibration for your vehicle, exhaust and other modifications.\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":"2026-10-08T10:41:27+01:00","handle":"kooks-2009-2023-dodge-charger-challenger-header-conn-kits-704faa61","updated_at":"2026-10-10T19:11:09+01:00","published_at":"2026-10-09T13:39:38+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, dept:performance-parts, fits:dodge-challenger, fits:dodge-charger, make:dodge, type:header-kit","variants":[{"id":55646902813014,"product_id":11350213919062,"title":"6.2L Hellcat \/ 2\" \/ H.O. GREEN Cats","price":"4221.59","sku":"3103H640","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"6.2L Hellcat","option2":"2\"","option3":"H.O. GREEN Cats","created_at":"2026-10-08T10:41:27+01:00","updated_at":"2026-10-10T19:11:09+01:00","taxable":true,"barcode":"842422179946","grams":29484,"image_id":null,"weight":29.484,"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":14512397320534,"product_id":11350213919062,"name":"Vehicle Trim","position":1,"values":["6.2L Hellcat"]},{"id":14512397353302,"product_id":11350213919062,"name":"Header Size","position":2,"values":["2\""]},{"id":14512397386070,"product_id":11350213919062,"name":"Cat Type","position":3,"values":["H.O. GREEN Cats"]}],"images":[{"id":86449260790102,"product_id":11350213919062,"position":1,"created_at":"2026-10-08T10:41:27+01:00","updated_at":"2026-10-08T10:41:30+01:00","alt":"Kooks 2\" Header and H.O. 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