{"product":{"id":11350215491926,"title":"Kooks 3-1\/2\" Whelen Modified Quad-Core Muffler - QCN350","body_html":"\u003ch2\u003eFinish your Whelen Modified exhaust with a quad-core muffler\u003c\/h2\u003e\u003cp\u003eThe Kooks QCN350 is a directional quad-core muffler built to the NASCAR Whelen Modified specification. Its polished stainless steel body gives your race exhaust a clean finish, with a 3-1\/2\" ID inlet and a 3-1\/2\" OD outlet to match your pipework. Check the body and overall dimensions below when planning the space around it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSKU:\u003c\/strong\u003e QCN350\u003c\/p\u003e\u003ch2\u003eMatch the inlet and outlet correctly\u003c\/h2\u003e\u003cp\u003eThe inlet is 3-1\/2\" inside diameter; the outlet is 3-1\/2\" outside diameter. Those are different joint interfaces, even though the nominal number is the same. The muffler is directional, so follow the intended flow orientation when fitting.\u003c\/p\u003e\u003ch2\u003eAllow room for the complete body\u003c\/h2\u003e\u003cp\u003eThe body has a 5\" outside diameter and an 8\" body length. Overall length is 16\". Match the footprint and connections to the exhaust design, and check the current rules and sound limits for the event you intend to enter.\u003c\/p\u003e\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\u003ctable\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\u003eQCN350\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication type\u003c\/td\u003e\n\u003ctd\u003eNASCAR Whelen Modified-specification race muffler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDesign\u003c\/td\u003e\n\u003ctd\u003eDirectional; quad-core\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial and finish\u003c\/td\u003e\n\u003ctd\u003ePolished stainless steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet\u003c\/td\u003e\n\u003ctd\u003e3-1\/2\" inside diameter (ID)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutlet\u003c\/td\u003e\n\u003ctd\u003e3-1\/2\" outside diameter (OD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody diameter\u003c\/td\u003e\n\u003ctd\u003e5\" outside diameter (OD)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBody length\u003c\/td\u003e\n\u003ctd\u003e8\" body length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOverall length\u003c\/td\u003e\n\u003ctd\u003e16\" overall length\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003eOne muffler; sold individually\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eFAQs\u003c\/h2\u003e\u003ch3\u003eAre both ends 3-1\/2\" inside diameter?\u003c\/h3\u003e\u003cp\u003eNo. The inlet is 3-1\/2\" ID and the outlet is 3-1\/2\" OD. Match each joint to that interface.\u003c\/p\u003e\u003ch3\u003eCan it be fitted in either direction?\u003c\/h3\u003e\u003cp\u003eIt is a directional muffler. Fit it in the intended flow orientation.\u003c\/p\u003e\u003ch3\u003eDoes the name guarantee acceptance at my event?\u003c\/h3\u003e\u003cp\u003eThe name identifies its specification. Check the current event requirements and sound limits for your complete race exhaust.\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":"Mufflers","created_at":"2026-10-08T10:41:33+01:00","handle":"kooks-qcn350","updated_at":"2026-10-11T06:40:36+01:00","published_at":"2026-10-09T13:07:39+01:00","template_suffix":null,"published_scope":"global","tags":"brand:kooks, cat:exhausts, class:equipment-service-non-vehicle, dept:performance-parts, type:muffler","variants":[{"id":55646904746326,"product_id":11350215491926,"title":"Default Title","price":"110.30","sku":"QCN350","position":1,"compare_at_price":"","fulfillment_service":"manual","inventory_management":null,"option1":"Default Title","option2":null,"option3":null,"created_at":"2026-10-08T10:41:33+01:00","updated_at":"2026-10-11T06:40:36+01:00","taxable":true,"barcode":"842422136468","grams":3629,"image_id":null,"weight":3.629,"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":14512399122774,"product_id":11350215491926,"name":"Title","position":1,"values":["Default Title"]}],"images":[{"id":86449277141334,"product_id":11350215491926,"position":1,"created_at":"2026-10-08T10:41:33+01:00","updated_at":"2026-10-08T10:41:36+01:00","alt":"Kooks 3-1\/2\" NASCAR Whelen Modified Spec. 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