{"product":{"id":11350207758678,"title":"Kooks Corvette C8 H.O. GREEN Catalytic Connections | 21803400","body_html":"\u003ch2\u003eChoose H.O. GREEN cats for your Stingray build\u003c\/h2\u003e\u003cp\u003eUpgrade the front catalytic connections on your supported C8 Stingray with Kooks H.O. GREEN pipework. The flanged stainless set joins the OEM manifolds or matching Kooks headers and the OEM cat-back, with gaskets and a bolt kit included. Tuning is required for this installation.\u003c\/p\u003e\u003cp\u003eSKU: 21803400\u003c\/p\u003e\u003ch2\u003eA defined high-output catalyst specification\u003c\/h2\u003e\u003cp\u003eThe 3\" connections use H.O. GREEN catalysts with 304 stainless steel outer bodies and a 4-1\/2-inch-diameter, 300-cell metallic substrate. That gives you the exact H.O. GREEN specification when comparing it with the separate Ultra-GREEN connection sets.\u003c\/p\u003e\u003ch2\u003eKeep the factory front and rear interfaces\u003c\/h2\u003e\u003cp\u003eThe flanged inlet and outlet use the stock bolt pattern. You can retain the factory manifolds and a rear system using the OEM connection, or pair the cats with matching Kooks headers. Plan the required tuning alongside installation.\u003c\/p\u003e\u003ch2\u003eArrange the required tuning\u003c\/h2\u003e\u003cp\u003eTuning is required for these H.O. GREEN connections. Our \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/products\/chevrolet-corvette-stingray-c8-ecu-tuning-2020\"\u003eC8 Stingray ECU tuning\u003c\/a\u003e service offers custom dyno or remote calibration for the listed Stingray. \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/pages\/contact\"\u003eContact us\u003c\/a\u003e to discuss the complete setup.\u003c\/p\u003e\u003ch2\u003eMatching products\u003c\/h2\u003e\u003cp\u003eThe \u003ca href=\"https:\/\/hooniesadrenaline.co.uk\/products\/kooks-21801400?variant=55646893408598\"\u003eStingray Super Street headers\u003c\/a\u003e give the listed Stingray an additional header upgrade using the OEM-cat interface. Tuning is required for the H.O. GREEN cats on this page.\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\u003e2020-2026\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette Stingray\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e21803400\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\u003e21803400\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplications\u003c\/td\u003e\n\u003ctd\u003eSupported C8 Stingray 6.2L LT2 years below\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePipework\u003c\/td\u003e\n\u003ctd\u003e3\" stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCatalysts\u003c\/td\u003e\n\u003ctd\u003eH.O. GREEN; 304 stainless outer bodies\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSubstrate\u003c\/td\u003e\n\u003ctd\u003e300-cell metallic substrate; 4-1\/2-inch diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFront interface\u003c\/td\u003e\n\u003ctd\u003eOEM manifolds or matching Kooks headers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear interface\u003c\/td\u003e\n\u003ctd\u003eOEM cat-back\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlanges\u003c\/td\u003e\n\u003ctd\u003eStock bolt pattern\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003ctd\u003eGaskets and bolt kit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTuning\u003c\/td\u003e\n\u003ctd\u003eRequired\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\u003eCan I retain the factory manifolds?\u003c\/h3\u003e\u003cp\u003eYes. The inlet connects directly to them or to matching Kooks headers.\u003c\/p\u003e\u003ch3\u003eIs tuning required?\u003c\/h3\u003e\u003cp\u003eYes, for these H.O. GREEN connections.\u003c\/p\u003e\u003ch3\u003eAre these the same as Ultra-GREEN cats?\u003c\/h3\u003e\u003cp\u003eThis set uses H.O. GREEN catalysts with a 300-cell, 4-1\/2-inch-diameter substrate. Ultra-GREEN sets are separate products.\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":"Exhaust Pipes","created_at":"2026-10-08T10:41:07+01:00","handle":"kooks-21803400","updated_at":"2026-10-10T19:59:15+01:00","published_at":"2026-10-09T13:42:52+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, dept:performance-parts, fits:chevrolet-corvette, make:chevrolet, type:exhaust-pipe","variants":[{"id":55646895145302,"product_id":11350207758678,"title":"Default Title","price":"2855.84","sku":"21803400","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-10-08T10:41:07+01:00","updated_at":"2026-10-10T19:59:15+01:00","taxable":true,"barcode":"842422181185","grams":8618,"image_id":null,"weight":8.618,"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":14512389456214,"product_id":11350207758678,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":86449203315030,"product_id":11350207758678,"position":1,"created_at":"2026-10-08T10:41:07+01:00","updated_at":"2026-10-08T10:41:10+01:00","alt":"Kooks 3\" High Output GREEN Catted OEM Connections. 2020+ Chevrolet Corvette C8.","width":1936,"height":1460,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/85f60717424e585e410f8b42833d4288_8335ca79-cfb1-45c0-ab99-69979e15c488.jpg?v=1791452470","variant_ids":[]},{"id":86449203347798,"product_id":11350207758678,"position":2,"created_at":"2026-10-08T10:41:07+01:00","updated_at":"2026-10-08T10:41:10+01:00","alt":"Kooks 3\" High Output GREEN Catted OEM Connections. 2020+ Chevrolet Corvette C8.","width":2271,"height":1713,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/835a339f3f65f4187ad70a2d2ca060f4.jpg?v=1791452470","variant_ids":[]},{"id":86449203380566,"product_id":11350207758678,"position":3,"created_at":"2026-10-08T10:41:07+01:00","updated_at":"2026-10-08T10:41:10+01:00","alt":"Kooks 3\" High Output GREEN Catted OEM Connections. 2020+ Chevrolet Corvette C8.","width":1794,"height":1353,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/e3ed612510bf256e96b0edf6082f1efa.jpg?v=1791452470","variant_ids":[]},{"id":86449203413334,"product_id":11350207758678,"position":4,"created_at":"2026-10-08T10:41:07+01:00","updated_at":"2026-10-08T10:41:09+01:00","alt":"Kooks 3\" High Output GREEN Catted OEM Connections. 2020+ Chevrolet Corvette C8.","width":1965,"height":1483,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/9a01850a12ccaab65c1aeb5f3f52c0d9_dbda5439-75aa-4293-9a15-8dabe2069670.jpg?v=1791452469","variant_ids":[]}],"image":{"id":86449203315030,"product_id":11350207758678,"position":1,"created_at":"2026-10-08T10:41:07+01:00","updated_at":"2026-10-08T10:41:10+01:00","alt":"Kooks 3\" High Output GREEN Catted OEM Connections. 2020+ Chevrolet Corvette C8.","width":1936,"height":1460,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/85f60717424e585e410f8b42833d4288_8335ca79-cfb1-45c0-ab99-69979e15c488.jpg?v=1791452470","variant_ids":[]}}}