Walker 21539 Quiet-Flow SS Stainless Steel Muffler - Direct Fit, 2.5" Inlet/Outlet

Important Buyer Notes

• Fitment: Buyer is responsible for confirming this muffler fits their exact vehicle (year, make, model, engine, trim, wheelbase, exhaust configuration, etc.) before purchase. No fitment tool available—verify using Walker's website/catalog, vehicle manual, VIN, forums, or a mechanic. We do not guarantee compatibility or provide fitment advice. Incorrect fitment does not qualify for returns/exchanges under our 30-day policy.
• Warranty/Returns: No warranty provided by seller or manufacturer. Sold new but as-is. 30-day returns only for unwanted items or clear wrong-part errors (after buyer verification). No returns/exchanges for defects, performance issues (e.g., sound quality, leaks, rust), installation problems, or fitment mismatches.
• Free Shipping on this item (continental US only; exclusions may apply).

Examples of Vehicles This Part Is Commonly Associated With (for informational purposes only; buyer must independently verify exact fitment): Select 2004–2008 Ford F-150 (various trims, including Heritage models; often 4.6L/5.4L V8 configs) and 2006 Lincoln Mark LT. Always confirm your specific year/model/wheelbase against manufacturer resources.

Walker 21539 Quiet-Flow SS Stainless Steel Muffler Premium direct-fit replacement for quiet, OE-style performance: This Quiet-Flow SS muffler from Walker features 100% stainless steel construction (heads, shell, bushings, tubes, partitions) for superior corrosion resistance and longer life than aluminized mufflers. Delivers factory sound, excellent flow, and precision fit on compatible trucks.

Key Features & Benefits

• 100% stainless steel – exceptional rust resistance and extended durability
• Direct-fit OE design – precision cross-sections, hangers, and routing for bolt-on installation (no fabrication required on listed apps)
• Quiet-Flow acoustics – OE-style quiet, smooth ride with superior flow
• Premium build – mechanically joined tubes and spun-locked heads for reliability

Dimensions & Specs

• Overall Length: 32.00"
• Body Length: 28.00"
• Body Width: 9.00"
• Body Height: 7.00"
• Inlet Diameter: 2.50" (ID, offset)
• Outlet Diameter: 2.50" (ID, offset)
• Material: 409 Stainless Steel
• Inlet/Outlet: 1 in / 1 out (offset inlet 1.625")

Orders ship via USPS, FedEx or UPS depending on the purchase price, size and weight.

Will only ship to the lower 48 states. No international shipping.