{"product":{"id":11350218441046,"title":"Kooks 2-1\/8 x 4-inch Weld-Up Header Kit | WK2880","body_html":"\u003ch2\u003eBuild your custom headers with a 4-inch outlet\u003c\/h2\u003e\u003cp\u003eFor a fabrication project that calls for a 4-inch collector outlet, Kooks WK2880 supplies the bends and collectors together. You get twelve 2-1\/8-inch 304 stainless J-bends and two collectors to shape the headers around your installation.\u003c\/p\u003e\u003cp\u003eSKU: WK2880\u003c\/p\u003e\u003ch2\u003eMatch the collector to the rest of the exhaust\u003c\/h2\u003e\u003cp\u003eThe kit includes twelve JB-213-30-18-304 bends and two 9911S collectors. It shares the 2-1\/8-inch tube size with the smaller-outlet kit, while the 4-inch collector lets you plan a different downstream exhaust diameter.\u003c\/p\u003e\u003ch2\u003eAdd the correct cylinder-head flanges\u003c\/h2\u003e\u003cp\u003eTwo header flanges are required separately. Choose the port and bolt pattern for your heads, then have the fabricator establish the tube routing and clearance before welding the final assembly.\u003c\/p\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\u003eWK2880\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eWeld-up custom header fabrication\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary tube diameter\u003c\/td\u003e\n\u003ctd\u003e2-1\/8-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollector outlet diameter\u003c\/td\u003e\n\u003ctd\u003e4-inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded bends\u003c\/td\u003e\n\u003ctd\u003eTwelve JB-213-30-18-304 J-bends\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded collectors\u003c\/td\u003e\n\u003ctd\u003eTwo 9911S collectors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeader flanges\u003c\/td\u003e\n\u003ctd\u003eTwo flanges required; purchased separately\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\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003ch3\u003eWhat is the difference from WK2850?\u003c\/h3\u003e\u003cp\u003eWK2880 uses 4-inch-outlet collectors. WK2850 uses 3-1\/2-inch-outlet collectors; both kits use 2-1\/8-inch J-bends.\u003c\/p\u003e\u003ch3\u003eHow many bends and collectors are supplied?\u003c\/h3\u003e\u003cp\u003eTwelve JB-213-30-18-304 J-bends and two 9911S collectors. Two cylinder-head flanges are separate purchases.\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 Fabrication Components","created_at":"2026-10-08T10:41:45+01:00","handle":"kooks-wk2880","updated_at":"2026-10-11T11:01:18+01:00","published_at":"2026-10-09T13:36:40+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, class:equipment-service-non-vehicle, dept:performance-parts, type:exhaust-fabrication-component","variants":[{"id":55646910677334,"product_id":11350218441046,"title":"Default Title","price":"1048.47","sku":"WK2880","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-10-08T10:41:45+01:00","updated_at":"2026-10-11T11:01:18+01:00","taxable":true,"barcode":"842422180201","grams":20412,"image_id":null,"weight":20.412,"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":14512402465110,"product_id":11350218441046,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":86449304535382,"product_id":11350218441046,"position":1,"created_at":"2026-10-08T10:41:45+01:00","updated_at":"2026-10-08T10:41:48+01:00","alt":"Kooks 2-1\/8\" x 4\" 304 Stainless Steel Header Weld Up Custom Header Kit","width":1103,"height":762,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/5ce9f47c98eed524f13efb4c96a1bebe_1f837c0e-946f-4b34-bc0f-8167ce729e5d.jpg?v=1791452508","variant_ids":[]}],"image":{"id":86449304535382,"product_id":11350218441046,"position":1,"created_at":"2026-10-08T10:41:45+01:00","updated_at":"2026-10-08T10:41:48+01:00","alt":"Kooks 2-1\/8\" x 4\" 304 Stainless Steel Header Weld Up Custom Header Kit","width":1103,"height":762,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/5ce9f47c98eed524f13efb4c96a1bebe_1f837c0e-946f-4b34-bc0f-8167ce729e5d.jpg?v=1791452508","variant_ids":[]}}}