{"product_id":"mbrp-muffler-armor-plus-universal-fit-t409-stainless-steel-4-inch","title":"MBRP Muffler – Armor Plus – Universal Fit – T409 Stainless Steel – 4-Inch","description":"\u003cp\u003e\u003cspan\u003e\u003cstrong\u003eFree shipping on this MBRP Armor Plus 4-inch universal muffler.\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eForged for builders who demand longevity, tone control, and engineered flow, this MBRP Armor Plus muffler uses \u003cstrong\u003eT409 stainless steel\u003c\/strong\u003e to deliver premium durability in real‑world conditions. The \u003cstrong\u003e4-inch diameter\u003c\/strong\u003e supports diesel and high‑output gas applications where exhaust velocity, thermal stability, and structural integrity matter.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIts straight‑through internal core maintains efficient exhaust evacuation while producing a deeper, more refined tone—clean, controlled, and built for trucks that work as hard as they sound.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Specs \u0026amp; Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUniversal‑fit performance muffler\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003e\u003cstrong\u003e4-inch diameter\u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eArmor Plus \u003cstrong\u003eT409 stainless steel\u003c\/strong\u003e construction\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eStraight‑through internal design for optimized flow\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eWelded seams for long‑term rigidity\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eSuitable for diesel and high‑output gas custom exhaust builds\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eDesigned for fabricators needing predictable, engineered flow behavior\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eVerified Fitment\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThis is a \u003cstrong\u003euniversal‑fit\u003c\/strong\u003e component. It is not designed for a specific Year\/Make\/Model and requires welding or fabrication.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWarranty\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eArmor Plus T409 stainless steel includes a \u003cstrong\u003eLifetime Warranty\u003c\/strong\u003e. Surface coloration from heat cycling is normal for T409 and not considered a defect.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eWhy It Works\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003e\u003cspan\u003eThe Armor Plus series is built for long‑term reliability. T409 stainless steel resists corrosion, heat, and vibration, making it ideal for tow rigs, work trucks, and performance‑focused builds. The 4-inch configuration provides a proven balance of tone, flow, and durability across a wide range of custom applications.\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eImportant Notes\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eUniversal‑fit; welding required\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eNot a clamp‑on design\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eT409 stainless will show natural heat cycling over time\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cspan\u003eProfessional installation recommended for proper alignment\u003c\/span\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MBRP","offers":[{"title":"Default Title","offer_id":51464423571777,"sku":"M91031","price":247.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0974\/1284\/1793\/files\/M91031_1-BKSJ.png?v=1773183077","url":"https:\/\/obsidianforgedautosupply.com\/products\/mbrp-muffler-armor-plus-universal-fit-t409-stainless-steel-4-inch","provider":"Obsidian Forged Auto Supply","version":"1.0","type":"link"}