{"product_id":"milltek-non-resonated-quad-outlet-cat-back-exhaust-for-ford-mustang-s550-2-3-ecoboost-roush-valance-cerakote-black-tips-ssxfd177","title":"Milltek Non-Resonated Quad-Outlet Cat-Back Exhaust for Ford Mustang S550 2.3 EcoBoost (Roush Valance), Cerakote Black Tips","description":"\u003cp\u003e\u003cstrong\u003eMilltek's Non-Resonated Cat-Back for the Ford Mustang 2.3 EcoBoost (S550, 2015 to 2018) is a 2.76-inch (70mm) T304L stainless steel system with a quad-tip outlet that gives the EcoBoost four its most aggressive Milltek voice, at direct OEM fitment.\u003c\/strong\u003e It is built for S550 EcoBoost owners who want maximum volume and presence, and bolts to the factory hangers with no cutting or welding.\u003c\/p\u003e\n\u003ch2\u003eWhat is the non-resonated cat-back for the EcoBoost Mustang?\u003c\/h2\u003e\n\u003cp\u003eIt is a full cat-back in hand-finished T304L stainless, mandrel-bent in 2.76-inch (70mm) pipe. Non-resonated means it omits the centre resonator, so it is the louder, more aggressive option in the range, with a quad-tip rear layout that gives the EcoBoost a wider-mouthed look and sound.\u003c\/p\u003e\n\u003ch2\u003eWho is it for?\u003c\/h2\u003e\n\u003cp\u003eIt suits the 2.3 EcoBoost S550 owner who wants the boldest tone Milltek offers for the car. If you cover long motorway miles and want to avoid cruise drone, the resonated version is the calmer choice.\u003c\/p\u003e\n\u003ch2\u003eWhat does it include and what are the specs?\u003c\/h2\u003e\n\u003cp\u003eThe system ships as a complete non-resonated cat-back with a quad-tip outlet, Cerakote Black tips, OEM-compatible hangers and the fixings for a bolt-on fit.\u003c\/p\u003e\n\u003ctable\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eMaterial\u003c\/td\u003e\n\u003ctd\u003eT304Lstainless, hand-finished\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePipe diameter\u003c\/td\u003e\n\u003ctd\u003e2.76\" (70mm), mandrel-bent\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eConfiguration\u003c\/td\u003e\n\u003ctd\u003eNon-resonated cat-back, quad-tip outlet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eTips\u003c\/td\u003e\n\u003ctd\u003eCerakote Black\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFitment\u003c\/td\u003e\n\u003ctd\u003eFord Mustang 2.3 EcoBoost (S550 Fastback), 2015 to 2018\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInstall\u003c\/td\u003e\n\u003ctd\u003eDirect OEM fitment, no cutting or welding\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\n\u003ch2\u003eWhat are the limitations, and who is it NOT for?\u003c\/h2\u003e\n\u003cp\u003eNon-resonated means louder, and it can drone at a steady cruise; choose the resonated version if that matters to you. This is a cat-back, so it does not change the catalytic converter or downpipe, and on a cat-back alone expect a tone upgrade rather than a headline power figure.\u003c\/p\u003e\n\u003cp\u003e Every system is built in hand-finished T304L stainless. \u003cem\u003e(Source: Milltek Sport, About Us.)\u003c\/em\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eLast updated:\u003c\/strong\u003e 2026-07-01.\u003c\/p\u003e\n\u003cp\u003eDesigned in Tennessee and manufactured in the UK with 40+ years of performance exhaust heritage. Tested on the Tail of the Dragon.\u003c\/p\u003e\n\u003ch3\u003eVehicle fitment\u003c\/h3\u003e\n\u003cul class=\"fitment-list\"\u003e\n\u003cli\u003e2015-2017 Ford Mustang V6\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang Base\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang EcoBoost\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang EcoBoost Premium\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang GT\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang GT Premium\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang Shelby GT350\u003c\/li\u003e\n\u003cli\u003e2015-2018 Ford Mustang Shelby GT350R\u003c\/li\u003e\n\u003cli\u003e2015 Ford Mustang GT 50 Years Limited Edition\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":60150859464990,"sku":"MILSSXFD177","price":2724.22,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0759\/7965\/3406\/files\/SSXFD177_1.jpg?v=1791256559","url":"https:\/\/shop.signatureautohaus.com\/products\/milltek-non-resonated-quad-outlet-cat-back-exhaust-for-ford-mustang-s550-2-3-ecoboost-roush-valance-cerakote-black-tips-ssxfd177","provider":"Signature Autohaus","version":"1.0","type":"link"}