{"product_id":"walker-21478-exhaust-muffler","title":"Walker 21478 Exhaust Muffler","description":"\u003ch2\u003eWalker Quiet-Flow SS Muffler for Explorer Sport Trac\u003c\/h2\u003e\u003cp\u003eWalker Quiet-Flow SS muffler Part Number 21478 is a direct-fit exhaust muffler for select 2001-2005 Ford Explorer Sport Trac applications. It uses 100% stainless-steel construction for the body and is built with an OE-style sound profile, precision fit, and steady exhaust flow.\u003c\/p\u003e\u003cp\u003eCompatible with 2001-2005 Ford Explorer Sport Trac models, this Quiet-Flow SS muffler is shaped as an oval combination muffler with offset 2.25-inch inlet and outlet pipe connections. The aluminized finish and stainless-steel body support long-term exhaust service in a factory-style replacement format.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eWalker Quiet-Flow SS product line for OE-style exhaust replacement\u003c\/li\u003e\n\u003cli\u003ePart Number 21478\u003c\/li\u003e\n\u003cli\u003eSpecific-fit muffler for 2001-2005 Ford Explorer Sport Trac\u003c\/li\u003e\n\u003cli\u003eOval combination muffler design\u003c\/li\u003e\n\u003cli\u003e2.25-inch inlet and 2.25-inch outlet\u003c\/li\u003e\n\u003cli\u003eOffset inlet and outlet configuration\u003c\/li\u003e\n\u003cli\u003eStainless-steel body construction\u003c\/li\u003e\n\u003cli\u003eAluminized finish\u003c\/li\u003e\n\u003cli\u003eOverall length: 29 inches\u003c\/li\u003e\n\u003cli\u003eBody dimensions: 25 inches long, 9 inches wide, 7 inches high\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eProduct Details\u003c\/h2\u003e\u003cp\u003eWalker Quiet-Flow SS is a stainless-steel muffler line built for drivers who want a direct replacement that maintains factory-like sound characteristics while supporting efficient exhaust flow. Part Number 21478 follows the original-style fitment for the Ford Explorer Sport Trac and uses pipe connection ends with a 2.25-inch inlet and outlet diameter. This makes it a practical choice for exhaust repair work where fit, sound, and material durability matter.\u003c\/p\u003e\u003cp\u003eThis part cross-references OSC 2455 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Exhaust Issues It Can Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRust-through or corrosion in the original muffler body\u003c\/li\u003e\n\u003cli\u003eExhaust noise caused by a damaged internal muffler structure\u003c\/li\u003e\n\u003cli\u003eRestricted exhaust flow from a deteriorated muffler\u003c\/li\u003e\n\u003cli\u003eFitment problems when replacing a worn factory-style muffler\u003c\/li\u003e\n\u003cli\u003eLoss of OE-style exhaust tone on a 2001-2005 Ford Explorer Sport Trac\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eVerify inlet and outlet diameter, offset configuration, and overall length before installation. This muffler uses pipe connection ends and is not reversible or tunable. For welded exhaust assemblies, replace all required related parts so the system aligns correctly and seals as intended.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eWalker Quiet-Flow SS mufflers are positioned as OE-style replacement components with precision fit and stainless-steel construction. For this application, the listed fitment is 2001-2005 Ford Explorer Sport Trac, and the product is backed by a limited lifetime warranty.\u003c\/p\u003e","brand":"Walker","offers":[{"title":"Default Title","offer_id":52071749910709,"sku":"BDCN-21478","price":95.15,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/WK_21478_Fro.jpg?v=1775142000","url":"https:\/\/www.partcatalog.com\/products\/walker-21478-exhaust-muffler","provider":"PartCatalog","version":"1.0","type":"link"}