{"product_id":"milltek-active-valved-cat-back-with-x-pipe-system-polished-tips-2026-mustang-5-0l-gt-fastback","title":"Milltek Active Valved Cat-Back with X-Pipe System (Polished Tips) – 2026 Mustang 5.0L GT Fastback","description":"\u003cdiv class=\"description\"\u003e\n    \u003cp\u003eThe \u003cstrong\u003eMilltek Active Valved Cat-Back Exhaust System\u003c\/strong\u003e with \u003cstrong\u003eX-Pipe\u003c\/strong\u003e and \u003cstrong\u003ePolished Tips\u003c\/strong\u003e is built for the 2026 Mustang GT owner who wants a sharper, cleaner exhaust note with better flow and true performance-backed tone. If you're looking for a factory-compatible, bolt-on system that finally makes the 5.0L Coyote sound like it should’ve from the factory, this one delivers without compromise.\u003c\/p\u003e\n    \n    \u003ch2\u003eWhat It Solves\u003c\/h2\u003e\n    \u003cp\u003eLet’s be real: the stock 2026 GT cat-back is tame, too quiet, and way too restrictive. It doesn’t do the dual-fuel 5.0L any justice. This Milltek system ditches the factory mufflers and resonators in favor of a high-flow, straight-through setup with an \u003cstrong\u003eX-pipe\u003c\/strong\u003e crossover that \u003cstrong\u003eamplifies higher-RPM tone\u003c\/strong\u003e while keeping things crisp. You still retain full use of the factory active valves—so you can tone it down when needed, or open it up when the road clears.\u003c\/p\u003e\n    \n    \u003ch2\u003eWhat It Improves Over Stock\u003c\/h2\u003e\n    \u003cul\u003e\n      \u003cli\u003eImproves \u003cstrong\u003eflow and throttle response\u003c\/strong\u003e by eliminating OEM bottlenecks\u003c\/li\u003e\n      \u003cli\u003eReplaces the factory midsection with an \u003cstrong\u003eX-pipe\u003c\/strong\u003e for a smoother, raspier European-style tone\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePolished tips\u003c\/strong\u003e give the rear profile a cleaner, finished look without being over the top\u003c\/li\u003e\n      \u003cli\u003eKeeps your \u003cstrong\u003eactive exhaust controls fully functional\u003c\/strong\u003e—so no weird wiring or tuning workarounds\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eThis system is one of several solid options in our \u003ca href=\"https:\/\/www.lethalperformance.com\/shop-now\/vehicle-selector\/ford-mustang-v8-gt\/2026-2025-mustang-gt\/exhaust\/catbacks\"\u003e2026-2025 Mustang GT Cat-Back Exhausts\u003c\/a\u003e, offering a refined take on Mustang sound and performance.\u003c\/p\u003e\n    \n    \u003ch2\u003eKey Features \u0026amp; Benefits\u003c\/h2\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eActive Valves Retained\u003c\/strong\u003e: Connect your OEM actuators and keep drive mode control—quiet for the commute, loud for the twisties.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eX-Pipe Midsection\u003c\/strong\u003e: More exotic tone vs. H-pipe setups—perfect if you prefer a sharper, higher-pitched sound at WOT.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePolished Quad Tips\u003c\/strong\u003e: Classic stainless finish that doesn’t distract from the rest of your build.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eT304 Stainless Steel\u003c\/strong\u003e: Durable, corrosion-resistant, and designed to handle heat cycles and mileage.\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp\u003eThis kit also belongs to the broader \u003ca href=\"https:\/\/www.lethalperformance.com\/shop-now\/vehicle-selector\/ford-mustang-v8-gt\/2026-2025-mustang-gt\/exhaust\/catbacks\/milltek\"\u003eMilltek cat-back exhaust systems\u003c\/a\u003e category, which includes additional finish and tip options if you're mixing performance with aesthetics.\u003c\/p\u003e\n    \n    \u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eMaterial\u003c\/strong\u003e: T304 stainless steel with polished quad tips\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eWeight Savings\u003c\/strong\u003e: Yes – lighter than stock due to thinner-wall stainless and fewer internal restrictions\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdjustability\u003c\/strong\u003e: Fully integrates with factory valve actuators—no tune needed\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eAdditional Required Components\u003c\/strong\u003e: None—valves transfer directly from stock\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003ePart Number\u003c\/strong\u003e: SSXFD425\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003ch2\u003eWho This is For\u003c\/h2\u003e\n    \u003cp\u003eThis system is ideal for \u003cstrong\u003e2026 Mustang GT Fastback owners\u003c\/strong\u003e with the \u003cstrong\u003eOEM active exhaust\u003c\/strong\u003e option who want a tone that’s sharper, more refined, and more free-flowing than stock. It’s a good fit for builds that include cold air kits or tuning, or even bone-stock cars that just need that missing edge. If your Mustang didn’t come with active exhaust from the factory, this kit won’t operate as intended.\u003c\/p\u003e\n    \n    \u003ch2\u003eFitment \u0026amp; Installation Notes\u003c\/h2\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eVehicle Compatibility\u003c\/strong\u003e: 2026 Ford Mustang GT Fastback (5.0L V8), manual and automatic\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDirect Fitment or Requires Modifications\u003c\/strong\u003e: Direct bolt-on with no cutting, trimming, or welding\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eInstallation Requirements\u003c\/strong\u003e:\n        \u003cul\u003e\n          \u003cli\u003eReuses factory exhaust valve actuators\u003c\/li\u003e\n          \u003cli\u003eNo tuning or calibration necessary\u003c\/li\u003e\n          \u003cli\u003e\n\u003cstrong\u003eProfessional installation recommended\u003c\/strong\u003e for correct fitment and tip alignment\u003c\/li\u003e\n        \u003c\/ul\u003e\n      \u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003ch3\u003eWarnings\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eOnly compatible with factory active exhaust\u003c\/strong\u003e—will not work correctly on non-valved vehicles\u003c\/li\u003e\n      \u003cli\u003e\u003cstrong\u003eNot designed for convertible models\u003c\/strong\u003e\u003c\/li\u003e\n      \u003cli\u003eWorks great as a standalone cat-back, but \u003cstrong\u003eto get full gains\u003c\/strong\u003e, pair it with headers or a high-flow mid-pipe\u003c\/li\u003e\n      \u003cli\u003eIf you're only swapping rear mufflers, you're missing out—\u003cstrong\u003emost buyers should go for the full cat-back system\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \n    \u003cp\u003eIf you're chasing a more refined, exotic-sounding tone and want to keep your Mustang’s factory drive mode functionality intact, this Milltek X-pipe system with polished tips is the way to go. It’s clean, sharp, and delivers the kind of sound the 5.0L deserves.\u003c\/p\u003e    \n\u003c\/div\u003e\n\u003cstyle\u003e\n    .description a {\n        color: #00a2e5 !important;\n    }\n    .description ul {\n        list-style: disc !important;\n        margin-left: 20px !important;\n        margin-bottom: 30px !important;\n    }\n    .description li {\n        float: none !important;\n    }\n    .description h2 {\n        margin-bottom: 20px;\n        display: block !important;\n    }\n    .description iframe {\n        margin: 30px auto;\n    }\n    .description hr {\n        margin: 30px auto;\n    }\n\u003c\/style\u003e","brand":"Milltek","offers":[{"title":"Default Title","offer_id":48146748375298,"sku":"MTK-SSXFD425","price":3153.29,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/0618\/0354\/files\/ssxfd425.jpg?v=1785009128","url":"https:\/\/www.lethalperformance.com\/products\/milltek-active-valved-cat-back-with-x-pipe-system-polished-tips-2026-mustang-5-0l-gt-fastback","provider":"Lethal Performance","version":"1.0","type":"link"}