{"product":{"id":11350202745174,"title":"Kooks 2-1\/4 x 4-inch Slip-On Header Collector | 9912S","body_html":"\u003ch2\u003eFinish your custom header with the right collector\u003c\/h2\u003e\u003cp\u003eKooks 9912S brings four 2-1\/4-inch primary tubes into a 4-inch outlet for your fabricated header. The 304 stainless slip-on design includes the patented scavenging spike and two A\/B-style securing tabs.\u003c\/p\u003e\u003cp\u003eSKU: 9912S\u003c\/p\u003e\u003ch2\u003eMatch inside and outside diameters\u003c\/h2\u003e\u003cp\u003eThe 2-1\/4-inch inside-diameter inlets slip over matching outside-diameter primary tubes. The outlet is 4-inch outside diameter, so use that separate dimension to choose the connecting exhaust.\u003c\/p\u003e\u003ch2\u003eOne collector per item\u003c\/h2\u003e\u003cp\u003eThe collector is sold individually. Choose the quantity for your fabricated header layout, with the supplied tabs used to secure it to the primary tubes.\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\u003e9912S\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eCustom header fabrication; single collector\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePrimary inlet diameter\u003c\/td\u003e\n\u003ctd\u003e2-1\/4-inch inside diameter; slips over matching outside diameter primary tubes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollector outlet diameter\u003c\/td\u003e\n\u003ctd\u003e4-inch outside diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollector design\u003c\/td\u003e\n\u003ctd\u003eFour-into-one with patented scavenging spike\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eIncluded\u003c\/td\u003e\n\u003ctd\u003eTwo A\/B-style tabs to secure collector to primaries\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\u003eIs this sold as a pair?\u003c\/h3\u003e\u003cp\u003e9912S is sold individually. Order the quantity your header assembly requires.\u003c\/p\u003e\u003ch3\u003eWhat do the two stated sizes refer to?\u003c\/h3\u003e\u003cp\u003e2-1\/4 inches is the inlet inside diameter at the primary tubes. 4 inches is the collector outlet outside diameter.\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":"2026-10-08T10:40:47+01:00","handle":"kooks-9912s","updated_at":"2026-10-11T10:14:49+01:00","published_at":"2026-10-09T13:45:54+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":55646888100182,"product_id":11350202745174,"title":"Default Title","price":"293.05","sku":"9912S","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-10-08T10:40:48+01:00","updated_at":"2026-10-11T10:14:49+01:00","taxable":true,"barcode":"842422144135","grams":4536,"image_id":null,"weight":4.536,"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":14512382804310,"product_id":11350202745174,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":86449170153814,"product_id":11350202745174,"position":1,"created_at":"2026-10-08T10:40:48+01:00","updated_at":"2026-10-08T10:40:51+01:00","alt":"Kooks 2-1\/4\" x 4\" 304 Stainless Steel Slip-On Collector","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/ee8771804a63e7ca0f78c9313f3a1ede_5f365a85-a542-43ec-844c-98f7ad78231d.jpg?v=1791452451","variant_ids":[]}],"image":{"id":86449170153814,"product_id":11350202745174,"position":1,"created_at":"2026-10-08T10:40:48+01:00","updated_at":"2026-10-08T10:40:51+01:00","alt":"Kooks 2-1\/4\" x 4\" 304 Stainless Steel Slip-On Collector","width":1500,"height":1500,"src":"https:\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/ee8771804a63e7ca0f78c9313f3a1ede_5f365a85-a542-43ec-844c-98f7ad78231d.jpg?v=1791452451","variant_ids":[]}}}