Walker 21431 Exhaust Muffler

Walker Quiet-Flow SS Muffler for OE-Style Exhaust Service

Walker Quiet-Flow SS muffler Part Number 21431 is a specific-fit exhaust muffler built for direct replacement applications on select Cadillac, GMC, and Hummer vehicles. It uses stainless-steel body construction with an OE-style sound profile and precision fitment for service work on the exhaust system.

Key Features

• Walker Quiet-Flow SS line for OE-style exhaust replacement
• 100% stainless-steel body construction for corrosion resistance
• Specific-fit design for direct application matching
• Oval muffler body with a combination muffler design
• Offset inlet and outlet configuration for listed vehicle applications
• 2.5-inch inlet inside diameter and 2.625-inch outlet inside diameter
• Overall length: 28 inches; body length: 24 inches; body width: 9 inches; body height: 7 inches
• Aluminized finish

Product Details

The Walker Quiet-Flow SS muffler line is built around stainless-steel construction and OE-style sound control for drivers replacing a worn exhaust muffler without changing the factory character of the vehicle. Part Number 21431 uses a specific-fit layout with dual 2.5-inch pipe-connection inlets, a single 2.625-inch pipe-connection outlet, and an offset configuration that matches the listed applications. This part cross-references Gates 2510 for the same application.

Fits 2001-2006 GMC Yukon, N/A. Fits 2001-2004 GMC Yukon XL 1500, N/A. Fits 2002-2004 Cadillac Escalade, N/A. Fits 2002-2004 Cadillac Escalade EXT, N/A. Fits 2003-2004 Cadillac Escalade ESV, N/A. Fits 2003-2006 Hummer H2, N/A. Fits 2005-2006 Cadillac Escalade, N/A. Fits 2005-2006 Cadillac Escalade ESV, N/A. Fits 2005-2006 Cadillac Escalade EXT, N/A. Fits 2005-2006 GMC Yukon XL 1500, N/A.

Common Uses

• Replacing a rusted or leaking factory muffler
• Restoring exhaust sound control after muffler failure
• Addressing exhaust noise from internal muffler deterioration
• Correcting fitment issues on listed Cadillac, GMC, and Hummer exhaust systems
• Servicing OE-style exhaust layouts that use offset inlet and outlet routing

Installation Notes

Verify inlet and outlet diameters, offset routing, and body dimensions before installation. This muffler is not reversible and is not tunable, so orientation must match the vehicle’s exhaust layout. If the exhaust uses a welded assembly, replace all required parts during service to maintain proper alignment and sealing. Confirm application details for Cadillac Escalade, GMC Yukon, and Hummer H2 models before ordering.

Quality Assurance

Walker Quiet-Flow SS mufflers are positioned as stainless-steel OE-style replacement parts with precision fit and controlled exhaust sound. Part Number 21431 is part of Walker’s Quiet-Flow SS product line for domestic and import vehicle applications.