{"product_id":"kooks-universal-3in-round-muffler-10in-long-pol-ss-stafford-spec-muffler","title":"Kooks R35-35-10 3.5 in. Round Stafford Spec Muffler 10 in. Body T304 Stainless Steel","description":"\u003ch4\u003eStafford Spec 3.5 Inch Round Stainless Muffler Engineered for Racing Exhaust Standards\u003c\/h4\u003e\n\n\u003cp\u003eThe \u003cstrong\u003eR35-35-10\u003c\/strong\u003e is a 3.5 inch Stafford spec round weld on muffler with a 10 inch body, constructed from T304 stainless steel to meet the specific requirements of Stafford Speedway class rules and similar short track racing regulations. Stafford spec muffler standards define a minimum noise attenuation threshold that keeps racecars compliant at venues with sound limits while still allowing the exhaust flow necessary to compete at the front of the field. This muffler is designed to meet those specifications without strangling the engine, making it the correct choice when you need a tech legal muffler that does not give up performance unnecessarily.\u003c\/p\u003e\n\n\u003cp\u003eAt 3.5 inches through and 10 inches of body length, the \u003cstrong\u003eR35-35-10\u003c\/strong\u003e flows generously for the pipe diameter, and T304 stainless construction handles the repeated high heat cycling of racing use without deteriorating. For circle track racers, drag racers, and road course competitors building to rulebooks that reference Stafford spec muffler standards, or for any builder who wants a 3.5 inch stainless weld on muffler in a short compact body, this muffler delivers a purpose built solution from a manufacturer with a deep history in performance exhaust engineering.\u003c\/p\u003e\n\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e3.5 inch inlet and outlet for maximum flow in 3.5 inch exhaust systems\u003c\/li\u003e\n  \u003cli\u003e10 inch body length in a compact Stafford spec round configuration\u003c\/li\u003e\n  \u003cli\u003eDesigned to meet Stafford Speedway and similar short track racing sound regulations\u003c\/li\u003e\n  \u003cli\u003eT304 stainless steel construction for durability in racing and high performance applications\u003c\/li\u003e\n  \u003cli\u003eWeld on installation for a permanent, secure exhaust connection\u003c\/li\u003e\n  \u003cli\u003eUniversal fitment for racecars and high performance street builds on 3.5 inch systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eWhat's Included\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e1 x this muffler 3.5 inch Stafford spec round weld on muffler with 10 inch body\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch4\u003eSpecifications\u003c\/h4\u003e\n\u003ctable\u003e\n  \u003cthead\u003e\n    \u003ctr\u003e\n      \u003cth\u003eSpecification\u003c\/th\u003e\n      \u003cth\u003eDetail\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003ePart Number (MPN)\u003c\/td\u003e\n\u003ctd\u003eR35-35-10\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eUPC\u003c\/td\u003e\n\u003ctd\u003eContact us for UPC\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInlet Diameter\u003c\/td\u003e\n\u003ctd\u003e3.5 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eOutlet Diameter\u003c\/td\u003e\n\u003ctd\u003e3.5 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Shape\u003c\/td\u003e\n\u003ctd\u003eRound\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eBody Length\u003c\/td\u003e\n\u003ctd\u003e10 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMuffler Spec\u003c\/td\u003e\n\u003ctd\u003eStafford Spec\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eT304 Stainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eInstallation Type\u003c\/td\u003e\n\u003ctd\u003eWeld On\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eUniversal (Racing and Performance Applications)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch4\u003eFrequently Asked Questions\u003c\/h4\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat does Stafford spec mean for a muffler?\u003c\/strong\u003e\u003cbr\u003e\nStafford spec refers to a muffler specification established by Stafford Speedway in Connecticut that defines a minimum level of sound attenuation for racecars competing at that venue. Other tracks and sanctioning bodies reference similar standards. A Stafford spec muffler must meet the required noise reduction threshold to pass tech inspection at compliant events.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat pipe size does this muffler require?\u003c\/strong\u003e\u003cbr\u003e\nThis muffler has a 3.5 inch inlet and 3.5 inch outlet, designed for installation into 3.5 inch exhaust tubing via weld on connections.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this muffler only for racing applications?\u003c\/strong\u003e\u003cbr\u003e\nNo. While it is designed to meet Stafford spec racing sound requirements, this muffler can be used in any 3.5 inch performance street or track exhaust application where a compact 10 inch round muffler is preferred.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWill this muffler pass tech at any track?\u003c\/strong\u003e\u003cbr\u003e\nThis muffler is designed to meet Stafford spec requirements. Whether it passes tech at a specific track depends on that track's muffler regulations. Always verify your track's specific rules before purchasing.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow is this muffler installed?\u003c\/strong\u003e\u003cbr\u003e\nThis muffler is welded into the exhaust system. Both inlet and outlet connections are welded to adjacent 3.5 inch exhaust tubing for a permanent installation.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat material is this muffler constructed from?\u003c\/strong\u003e\u003cbr\u003e\nT304 stainless steel, providing corrosion resistance, high temperature strength, and long service life in racing and street performance applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eHow loud is this muffler compared to a standard street muffler?\u003c\/strong\u003e\u003cbr\u003e\nThis muffler meets a defined spec for racing noise reduction. It is designed to pass track tech while maintaining performance flow, so it will be louder than a typical street muffler but quieter than an open or straight pipe exhaust.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eCan I use this muffler on a street vehicle?\u003c\/strong\u003e\u003cbr\u003e\nYes. The muffler provides sound attenuation appropriate for performance street use at the 3.5 inch pipe diameter, though it is likely louder than what a noise ordinance would permit on a street legal vehicle in many jurisdictions.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIs this muffler sold individually?\u003c\/strong\u003e\u003cbr\u003e\nYes. This muffler is sold as a single unit.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eDoes the inlet and outlet measure 3.5 inches inside diameter or outside diameter?\u003c\/strong\u003e\u003cbr\u003e\nExhaust muffler and pipe sizing conventions in the aftermarket typically refer to the nominal outside diameter of the pipe being connected. Confirm the pipe OD of your exhaust tubing matches 3.5 inch nominal before ordering.\u003c\/p\u003e\n\n\u003ch4\u003eInstallation Instructions\u003c\/h4\u003e\n\u003col\u003e\n  \u003cli\u003eConfirm track or series rulebook approval for this muffler before beginning installation.\u003c\/li\u003e\n  \u003cli\u003eWith the exhaust system cool, determine the muffler position in the exhaust path.\u003c\/li\u003e\n  \u003cli\u003eCut the 3.5 inch exhaust tubing at the inlet and outlet positions with proper allowance for weld joints.\u003c\/li\u003e\n  \u003cli\u003eInsert this muffler with the inlet toward the engine.\u003c\/li\u003e\n  \u003cli\u003eVerify clearance to chassis components, body panels, and the floor at the muffler body position.\u003c\/li\u003e\n  \u003cli\u003eTack weld to confirm alignment before completing full circumference welds at both connections.\u003c\/li\u003e\n  \u003cli\u003eUse T304 compatible welding filler for strong, corrosion resistant joints.\u003c\/li\u003e\n  \u003cli\u003eInspect welds and verify exhaust system integrity before the next event.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch4\u003eProp 65 Warning\u003c\/h4\u003e\n\u003cp\u003e\u003cstrong\u003eWARNING:\u003c\/strong\u003e This product can expose you to chemicals including Chromium and Nickel, which are known to the State of California to cause cancer, birth defects or reproductive harm. For more information go to \u003ca href=\"https:\/\/www.p65warnings.ca.gov\" target=\"_blank\" rel=\"nofollow\"\u003ewww.P65Warnings.ca.gov\u003c\/a\u003e.\u003c\/p\u003e","brand":"Kooks Headers","offers":[{"title":"Default Title","offer_id":39739892596815,"sku":"KSHR35-35-10","price":68.7,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1062\/7920\/files\/kooks-r353510-muffler_01.jpg?v=1764350855","url":"https:\/\/www.blackopsautoworks.com\/products\/kooks-universal-3in-round-muffler-10in-long-pol-ss-stafford-spec-muffler","provider":"Black Ops Auto Works","version":"1.0","type":"link"}