Walker 21422 Exhaust Muffler

Walker Quiet-Flow SS Muffler for Explorer and Mountaineer

Walker Quiet-Flow SS muffler part number 21422 is a specific-fit exhaust muffler built with 100% stainless-steel construction for corrosion resistance and consistent exhaust performance. It is engineered for OE-style sound, precise fitment, and improved flow on select Ford Explorer and Mercury Mountaineer applications.

Key Features

• Walker Quiet-Flow SS line for OE-style exhaust sound and fit
• 100% stainless-steel body construction
• Specific-fit design for direct application matching
• Oval muffler shape with combination muffler design
• 2.25 in. inlet and 2.25 in. outlet pipe connection
• Offset inlet and offset outlet configuration
• Body dimensions: 24 in. length, 9 in. width, 7 in. height
• Aluminized finish

Product Details

The Walker Quiet-Flow SS product line is built for drivers who want a replacement exhaust muffler that follows OE-style sound characteristics while maintaining stainless-steel durability. Part number 21422 uses a specific-fit layout with a 2.25-inch inlet and outlet, offset connections, and an oval body profile to match the listed vehicle applications. This muffler is a direct-fit exhaust solution for 2002-2005 Ford Explorer, 2002-2005 Mercury Mountaineer, and 2002-2003 Ford Explorer without Sport Package. This part cross-references Anchor 2409 for the same application.

Common Issues It Can Address

• Exhaust noise from a worn or rusted muffler
• Reduced exhaust flow caused by internal muffler deterioration
• Fitment problems when replacing a factory-style muffler
• Corrosion-related failure in the exhaust system
• Loss of OE-style exhaust tone after muffler damage

Installation Notes and Tips

Verify the vehicle year, make, model, and package details before installation. Fits 2002-2005 Ford Explorer, N/A; Fits 2002-2005 Mercury Mountaineer, N/A; Fits 2002-2003 Ford Explorer, N/A without Sport Package. Confirm the 2.25-inch pipe connection size and offset inlet/outlet configuration against the existing exhaust layout before welding or final assembly. If the exhaust uses a welded assembly, replace all required related parts during service.

Quality Assurance

Walker Quiet-Flow SS mufflers are manufactured with stainless-steel construction and are positioned as a premium exhaust replacement option with OE-style sound characteristics. Part number 21422 is listed for select Ford Explorer and Mercury Mountaineer applications and is backed by a limited lifetime warranty where applicable.