{"product_id":"2-5-to-2-header-collector-reducers-3-bolt-stainless-steel","title":"2.5\" to 2\" Header Collector Reducers – 3-Bolt Stainless Steel","description":"\u003ch1\u003e2.5\" to 2\" Header Collector Reducers – 3-Bolt Stainless Steel Pair\u003c\/h1\u003e\n\u003cp\u003eCreate a compact transition from \u003cstrong\u003e2.5-inch 3-bolt header collectors to 2-inch exhaust tubing\u003c\/strong\u003e with these \u003cstrong\u003e2.5\" to 2\" Header Collector Reducers\u003c\/strong\u003e from Certified Automotive Experts. Designed for custom exhaust systems where space is limited, these short collector reducers help simplify exhaust routing around transmissions, crossmembers, frame rails, and other chassis components.\u003c\/p\u003e\n\u003cp\u003eWith an overall length of approximately \u003cstrong\u003e2 inches from the flange face to the outlet\u003c\/strong\u003e, the compact design minimizes the amount of space used between the header and exhaust system. This makes them especially useful for \u003cstrong\u003eSmall Block Chevy headers, hot rods, classic cars, engine swaps, street machines, and custom exhaust builds\u003c\/strong\u003e using a compatible 2.5-inch 3-bolt collector flange.\u003c\/p\u003e\n\u003cp\u003eEach reducer features a \u003cstrong\u003eone-piece welded 3-bolt flange\u003c\/strong\u003e approximately 0.30 inch thick. Unlike loose collector flanges that must be positioned separately during fabrication, the integrated flange and reducer assembly provides a straightforward component for fitting and welding your exhaust system.\u003c\/p\u003e\n\u003cp\u003eThe reducers are constructed from \u003cstrong\u003epolished stainless steel\u003c\/strong\u003e, providing corrosion resistance and a clean appearance that complements custom exhaust installations. Each pair also includes \u003cstrong\u003e2.5-inch copper 3-bolt collector gaskets\u003c\/strong\u003e and a \u003cstrong\u003e3\/8\"-16 collector hardware kit\u003c\/strong\u003e, so you have the essential mounting components needed for the header-to-reducer connection.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eConverts \u003cstrong\u003e2.5-inch header collectors to 2-inch exhaust tubing\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for compatible \u003cstrong\u003e2.5-inch 3-bolt header collectors\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCompact approximately \u003cstrong\u003e2-inch overall length\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIdeal for tight exhaust-routing applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eOne-piece welded collector flange and reducer construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eApproximately \u003cstrong\u003e0.30-inch thick 3-bolt flange\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePolished stainless steel construction\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIncludes \u003cstrong\u003e2.5-inch copper collector gaskets\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIncludes \u003cstrong\u003e3\/8\"-16 collector mounting hardware\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHardware uses \u003cstrong\u003e9\/16-inch hex\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDesigned for welding into custom exhaust systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSuitable for Small Block Chevy headers and other compatible applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eSold as a pair\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCompact Design for Tight Exhaust Clearance\u003c\/h2\u003e\n\u003cp\u003eExhaust routing can become difficult when there is limited space between the headers and the rest of the exhaust system. A long reducer can consume valuable room around the transmission, crossmember, frame, floor, and other chassis components.\u003c\/p\u003e\n\u003cp\u003eThese \u003cstrong\u003e2.5-inch to 2-inch header collector reducers\u003c\/strong\u003e keep the transition short, with approximately \u003cstrong\u003e2 inches of length from the flange face to the outlet\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe compact design gives exhaust builders more flexibility when routing 2-inch tubing through tight areas, making these reducers particularly useful for custom-built vehicles and project cars where every inch of clearance matters.\u003c\/p\u003e\n\u003ch2\u003eOne-Piece 3-Bolt Collector Design\u003c\/h2\u003e\n\u003cp\u003eThe approximately \u003cstrong\u003e0.30-inch-thick 3-bolt flange is welded directly to the reducer\u003c\/strong\u003e, creating a one-piece assembly.\u003c\/p\u003e\n\u003cp\u003eThis design eliminates the need to position a separate loose flange while fabricating the exhaust. The integrated construction makes the reducer easier to position during installation and provides a clean starting point for connecting your 2-inch exhaust tubing.\u003c\/p\u003e\n\u003ch2\u003ePolished Stainless Steel Construction\u003c\/h2\u003e\n\u003cp\u003eThe reducers feature a \u003cstrong\u003epolished stainless steel construction\u003c\/strong\u003e designed to provide corrosion resistance and a clean appearance for custom exhaust systems.\u003c\/p\u003e\n\u003cp\u003eStainless steel is well suited to automotive exhaust applications where components are exposed to high temperatures, moisture, road conditions, and repeated heat cycles.\u003c\/p\u003e\n\u003ch2\u003eCopper Collector Gaskets Included\u003c\/h2\u003e\n\u003cp\u003eEach pair includes \u003cstrong\u003e2.5-inch copper 3-bolt collector gaskets\u003c\/strong\u003e for the connection between the header and reducer.\u003c\/p\u003e\n\u003cp\u003eCopper is well suited for exhaust collector applications because it can handle repeated temperature changes when properly installed. The supplied gaskets provide a dedicated sealing surface between the header collector and reducer flange.\u003c\/p\u003e\n\u003ch2\u003eCollector Hardware Included\u003c\/h2\u003e\n\u003cp\u003eYou don't need to purchase the collector mounting hardware separately.\u003c\/p\u003e\n\u003cp\u003eThe kit includes a \u003cstrong\u003e3\/8\"-16 collector hardware set\u003c\/strong\u003e with flange bolts and matching flange nuts featuring a \u003cstrong\u003e9\/16-inch hex\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThis gives you the essential hardware for securing the reducer to compatible 2.5-inch 3-bolt headers.\u003c\/p\u003e\n\u003ch2\u003eIdeal Applications\u003c\/h2\u003e\n\u003cp\u003eThese header collector reducers are suitable for a wide range of custom automotive applications, including:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eSmall Block Chevy headers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eHot rods\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eClassic cars\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMuscle cars\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eClassic trucks\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEngine swaps\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eStreet machines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustom-built vehicles\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProject cars\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eCustom exhaust fabrication\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePerformance exhaust systems\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTight-clearance exhaust installations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eWhat's Included?\u003c\/h2\u003e\n\u003cp\u003eEach pair includes:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e2 × 2.5\" to 2\" header collector reducers\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e2 × 2.5\" copper 3-bolt collector gaskets\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003e3\/8\"-16 collector hardware kit\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFlange bolts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eFlange nuts\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eHeader Collector Reducer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInlet Size\u003c\/td\u003e\n\u003ctd\u003e2.5 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutlet Size\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCollector Connection\u003c\/td\u003e\n\u003ctd\u003e3-Bolt\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApprox. Length\u003c\/td\u003e\n\u003ctd\u003e2 inches\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFlange Thickness\u003c\/td\u003e\n\u003ctd\u003eApprox. 0.30 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eStainless Steel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFinish\u003c\/td\u003e\n\u003ctd\u003ePolished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGasket Material\u003c\/td\u003e\n\u003ctd\u003eCopper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware Thread\u003c\/td\u003e\n\u003ctd\u003e3\/8\"-16\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHardware Hex Size\u003c\/td\u003e\n\u003ctd\u003e9\/16 inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eQuantity\u003c\/td\u003e\n\u003ctd\u003ePair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstallation\u003c\/td\u003e\n\u003ctd\u003eWeld-In \/ Custom Exhaust\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eUniversal, compatible 2.5\" 3-bolt headers\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eFitment \u0026amp; Compatibility\u003c\/h2\u003e\n\u003cp\u003eThese reducers are designed for headers using a compatible \u003cstrong\u003e2.5-inch 3-bolt collector flange\u003c\/strong\u003e and exhaust systems using \u003cstrong\u003e2-inch tubing\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThey are commonly suited to \u003cstrong\u003eSmall Block Chevy header applications\u003c\/strong\u003e, but they are not limited to one specific vehicle or engine.\u003c\/p\u003e\n\u003cp\u003eBefore ordering, verify:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eYour header collector diameter is 2.5 inches\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYour header uses a compatible 3-bolt collector pattern\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYour exhaust tubing is 2 inches\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eYou have sufficient clearance for the approximately 2-inch reducer length\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eThe collector flange and bolt pattern match your application\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eThis is a universal-style exhaust component and is not vehicle-specific.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n\u003ch3\u003eWhat size exhaust does this reducer fit?\u003c\/h3\u003e\n\u003cp\u003eIt transitions from a \u003cstrong\u003e2.5-inch header collector to 2-inch exhaust tubing\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eHow long are these collector reducers?\u003c\/h3\u003e\n\u003cp\u003eThe reducers are approximately \u003cstrong\u003e2 inches long from the flange face to the outlet\u003c\/strong\u003e, making them useful for tight exhaust installations.\u003c\/p\u003e\n\u003ch3\u003eAre these reducers compatible with Small Block Chevy headers?\u003c\/h3\u003e\n\u003cp\u003eYes. They are designed for use with \u003cstrong\u003eSmall Block Chevy headers using a compatible 2.5-inch 3-bolt collector flange\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs the 3-bolt flange included?\u003c\/h3\u003e\n\u003cp\u003eYes. The approximately 0.30-inch-thick 3-bolt flange is \u003cstrong\u003ewelded directly to the reducer\u003c\/strong\u003e as a one-piece assembly.\u003c\/p\u003e\n\u003ch3\u003eAre collector gaskets included?\u003c\/h3\u003e\n\u003cp\u003eYes. The pair includes \u003cstrong\u003e2.5-inch copper 3-bolt collector gaskets\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eIs mounting hardware included?\u003c\/h3\u003e\n\u003cp\u003eYes. A \u003cstrong\u003e3\/8\"-16 collector hardware kit\u003c\/strong\u003e with flange bolts and nuts is included.\u003c\/p\u003e\n\u003ch3\u003eWhat size hex do the included hardware pieces use?\u003c\/h3\u003e\n\u003cp\u003eThe included collector hardware uses a \u003cstrong\u003e9\/16-inch hex\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch3\u003eCan these reducers be welded to an exhaust system?\u003c\/h3\u003e\n\u003cp\u003eYes. The 2-inch outlet is intended to be incorporated into a compatible custom exhaust system.\u003c\/p\u003e\n\u003ch2\u003eWhy Choose These 2.5\" to 2\" Reducers?\u003c\/h2\u003e\n\u003cp\u003eWhen a vehicle has \u003cstrong\u003e2.5-inch headers but requires a 2-inch exhaust system\u003c\/strong\u003e, a compact collector reducer provides a simple way to make the transition without taking up unnecessary space.\u003c\/p\u003e\n\u003cp\u003eThe short approximately 2-inch design, integrated 3-bolt flange, polished stainless steel construction, copper gaskets, and included mounting hardware make this pair a practical solution for builders working on \u003cstrong\u003etight-clearance exhaust systems, Small Block Chevy projects, hot rods, classic cars, and custom engine swaps\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eAnswer-First Product Summary\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eWhat are these reducers?\u003c\/strong\u003e\u003cbr\u003eThese are a pair of \u003cstrong\u003e2.5-inch to 2-inch header collector reducers\u003c\/strong\u003e designed to connect compatible 2.5-inch 3-bolt header collectors to 2-inch exhaust tubing.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow long are they?\u003c\/strong\u003e\u003cbr\u003eEach reducer is approximately \u003cstrong\u003e2 inches long\u003c\/strong\u003e, providing a compact transition for tight exhaust-routing applications.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre they suitable for Small Block Chevy headers?\u003c\/strong\u003e\u003cbr\u003eYes. They are designed to work with \u003cstrong\u003eSmall Block Chevy headers that use a compatible 2.5-inch 3-bolt collector flange\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat is included?\u003c\/strong\u003e\u003cbr\u003eThe pair includes \u003cstrong\u003etwo stainless steel reducers, two copper 3-bolt collector gaskets, and 3\/8\"-16 collector mounting hardware\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eAre they vehicle-specific?\u003c\/strong\u003e\u003cbr\u003eNo. They are universal-style components. Always verify your header collector size, 3-bolt pattern, exhaust tubing size, and available clearance before installation.\u003c\/p\u003e","brand":"Certified Automotive Experts","offers":[{"title":"Default Title","offer_id":55942514180418,"sku":"CAE-2.5x2-COLL","price":299.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0716\/4664\/2498\/files\/2.5_to_2_Header_Collector_Reducers_3-Bolt_Stainless_Steel.jpg?v=1787570248","url":"https:\/\/certifiedautomotiveexperts.com\/products\/2-5-to-2-header-collector-reducers-3-bolt-stainless-steel","provider":"Certified Automotive Experts","version":"1.0","type":"link"}