{"product_id":"kooks-c7-x-pipes-test-aa5756bd","title":"Kooks X-Pipe and ULTRA X-Pipe Options for Corvette C7 (2014-2019)","description":"\u003ch2\u003eFinish your C7 header upgrade with the sound you want\u003c\/h2\u003e\u003cp\u003eThe X-pipe is more than a connection between your headers and rear exhaust. It is part of the sound and catalyst specification you choose for your Corvette. These Kooks stainless packages offer conventional X-pipe and ULTRA X-pipe layouts, with front connections and a 2-3\/4\" OEM rear connection for the listed C7 applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eSKUs:\u003c\/strong\u003e 21703100, 21703120, 21703220, 21703300, 21703320, 21703400, 21703420\u003c\/p\u003e\u003ch2\u003eChoose the crossover character\u003c\/h2\u003e\u003cp\u003eThe conventional X-pipe joins the two exhaust streams through a crossover. The ULTRA X-pipe uses a longer merge, combining a smooth exhaust character with a deeper muscle-car note. Choose the layout with your rear mufflers in mind; the finished sound comes from the whole system.\u003c\/p\u003e\u003ch2\u003eChoose catalysts for your engine\u003c\/h2\u003e\u003cp\u003ePerformance Cats are for naturally aspirated LT1 builds up to 550 RWHP. GREEN, H.O. GREEN and their different substrate and body specifications give naturally aspirated and forced-induction builds further choices. H.O. GREEN uses a 4-1\/2\" body with 300 CPSI substrate, while GREEN uses a 4\" body and 400 CPSI substrate. Competition Only options provide catalyst-free pipes for a dedicated competition exhaust.\u003c\/p\u003e\u003ch2\u003eKeep a compatible OEM rear exhaust\u003c\/h2\u003e\u003cp\u003eThese packages use 3\" pipework with a 2-3\/4\" OEM rear connection and require matching Kooks long tube headers. They include the front connection arrangement and mid-pipes. They are not an X-pipe replacement for factory exhaust manifolds.\u003c\/p\u003e\u003ch2\u003eMatch the engine as well as the crossover\u003c\/h2\u003e\u003cp\u003eThe conventional X-pipe options cover LT1, LT4 and LT5 applications. The ULTRA Competition, GREEN and H.O. GREEN options cover LT1 and LT4. Performance-catalyst SKU 21703220 is for naturally aspirated LT1 applications. Choose by the engine and SKU, especially for a ZR1. Have the installer check belly-pan and clamp-stud clearance and recheck fasteners after the first heat cycle.\u003c\/p\u003e\u003ch2\u003eChoose your option\u003c\/h2\u003e\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eSKU\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eMerge Style\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eCats\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eFitting \/ contents\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eStated use restriction\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703100\u003c\/td\u003e\n\u003ctd\u003eX Pipe\u003c\/td\u003e\n\u003ctd\u003eComp. Only\u003c\/td\u003e\n\u003ctd\u003eConventional X-pipe; LT1\/LT4\/LT5; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003eCompetition, off-road and track use only. Not for use on public roads. Kooks competition-use waiver required.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703120\u003c\/td\u003e\n\u003ctd\u003eULTRA X\u003c\/td\u003e\n\u003ctd\u003eComp. Only\u003c\/td\u003e\n\u003ctd\u003eULTRA long-merge X-pipe; LT1\/LT4; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003eCompetition, off-road and track use only. Not for use on public roads. Kooks competition-use waiver required.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703220\u003c\/td\u003e\n\u003ctd\u003eULTRA X\u003c\/td\u003e\n\u003ctd\u003ePerformance Cats\u003c\/td\u003e\n\u003ctd\u003eULTRA long-merge X-pipe; naturally aspirated LT1 applications up to 550 RWHP; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703300\u003c\/td\u003e\n\u003ctd\u003eX Pipe\u003c\/td\u003e\n\u003ctd\u003eGREEN Cats\u003c\/td\u003e\n\u003ctd\u003eConventional X-pipe; LT1\/LT4\/LT5; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703320\u003c\/td\u003e\n\u003ctd\u003eULTRA X\u003c\/td\u003e\n\u003ctd\u003eGREEN Cats\u003c\/td\u003e\n\u003ctd\u003eULTRA long-merge X-pipe; LT1\/LT4; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703400\u003c\/td\u003e\n\u003ctd\u003eX Pipe\u003c\/td\u003e\n\u003ctd\u003eH.O. GREEN Cats\u003c\/td\u003e\n\u003ctd\u003eConventional X-pipe; LT1\/LT4\/LT5; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e21703420\u003c\/td\u003e\n\u003ctd\u003eULTRA X\u003c\/td\u003e\n\u003ctd\u003eH.O. GREEN Cats\u003c\/td\u003e\n\u003ctd\u003eULTRA long-merge X-pipe; LT1\/LT4; 2-3\/4\" OEM rear outlet.\u003c\/td\u003e\n\u003ctd\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eVehicle fitment\u003c\/h2\u003e\u003ctable class=\"vehicle-fitment\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth scope=\"col\"\u003eYears\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eVehicle and trim\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eEngine\u003c\/th\u003e\n\u003cth scope=\"col\"\u003eApplicable SKU \/ fitting conditions\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette Stingray\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e21703100, 21703120, 21703220, 21703300, 21703320, 21703400, 21703420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2014-2016\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette Z51\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e21703100, 21703120, 21703220, 21703300, 21703320, 21703400, 21703420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2015-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette Z06\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e21703100, 21703120, 21703300, 21703320, 21703400, 21703420. Performance-catalyst 21703220 is for naturally aspirated builds, not the supercharged LT4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2017-2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette Grand Sport\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e21703100, 21703120, 21703220, 21703300, 21703320, 21703400, 21703420\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e2019\u003c\/td\u003e\n\u003ctd\u003eChevrolet Corvette ZR1\u003c\/td\u003e\n\u003ctd\u003e6.2L V8\u003c\/td\u003e\n\u003ctd\u003e21703100, 21703300, 21703400. Conventional X-pipe options only; ULTRA options cover LT1\/LT4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\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\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eCorvette C7, 2014-2019; exact engine scope shown by SKU\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConstruction\u003c\/td\u003e\n\u003ctd\u003e304 stainless steel; ULTRA X-pipe uses a long-merge crossover\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePipe diameter\u003c\/td\u003e\n\u003ctd\u003e3\" pipework\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRear connection\u003c\/td\u003e\n\u003ctd\u003e2-3\/4\" OEM rear-exhaust connection\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupplied exhaust parts\u003c\/td\u003e\n\u003ctd\u003eX-pipe arrangement with front connections and mid-pipes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRequired headers\u003c\/td\u003e\n\u003ctd\u003eMatching Kooks long tube headers, purchased separately\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePerformance catalyst limit\u003c\/td\u003e\n\u003ctd\u003eNaturally aspirated LT1 engines, up to 550 RWHP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitting detail\u003c\/td\u003e\n\u003ctd\u003eCheck belly-pan clearance; clamp studs may need trimming\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003ch2\u003eFAQs\u003c\/h2\u003e\u003ch3\u003eWill it fit the factory manifolds?\u003c\/h3\u003e\u003cp\u003eNo. This is the connection and X-pipe arrangement for matching Kooks long tube headers.\u003c\/p\u003e\u003ch3\u003eDoes every ULTRA version fit an LT5 ZR1?\u003c\/h3\u003e\u003cp\u003eFor an LT5 ZR1, choose conventional X-pipe 21703100, 21703300 or 21703400. The ULTRA Competition, GREEN and H.O. GREEN choices here cover LT1\/LT4; Performance-catalyst 21703220 is for naturally aspirated LT1 applications.\u003c\/p\u003e\u003ch3\u003eCan I keep the original rear exhaust?\u003c\/h3\u003e\u003cp\u003eYes, using the compatible 2-3\/4\" OEM rear connection.\u003c\/p\u003e\u003ch3\u003eIs ULTRA X-pipe the same thing as ULTRA-GREEN?\u003c\/h3\u003e\u003cp\u003eNo. ULTRA X-pipe describes the crossover layout. ULTRA-GREEN is a catalyst type, and is not an offered catalyst option on this page.\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","brand":"Kooks","offers":[{"title":"X Pipe \/ Comp. Only","offer_id":55646891934038,"sku":"21703100","price":1723.44,"currency_code":"GBP","in_stock":true},{"title":"ULTRA X \/ Comp. Only","offer_id":55646891966806,"sku":"21703120","price":1791.69,"currency_code":"GBP","in_stock":true},{"title":"ULTRA X \/ Performance Cats","offer_id":55646891999574,"sku":"21703220","price":2075.68,"currency_code":"GBP","in_stock":true},{"title":"X Pipe \/ GREEN Cats","offer_id":55646892032342,"sku":"21703300","price":2575.42,"currency_code":"GBP","in_stock":true},{"title":"ULTRA X \/ GREEN Cats","offer_id":55646892065110,"sku":"21703320","price":2643.67,"currency_code":"GBP","in_stock":true},{"title":"X Pipe \/ H.O. GREEN Cats","offer_id":55646892097878,"sku":"21703400","price":3096.07,"currency_code":"GBP","in_stock":true},{"title":"ULTRA X \/ H.O. GREEN Cats","offer_id":55646892130646,"sku":"21703420","price":3164.32,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0952\/1849\/9926\/files\/b9a4c102f4e13e866fd418ca6641ebb8_4c9494e1-a928-4a36-ba17-f83a289a80f5.png?v=1791452464","url":"https:\/\/hooniesadrenaline.co.uk\/products\/kooks-c7-x-pipes-test-aa5756bd","provider":"Hoonies Adrenaline","version":"1.0","type":"link"}