Walker 21684 Exhaust Muffler

Walker Quiet-Flow SS Muffler Overview

Walker Quiet-Flow SS muffler Part Number 21684 is a specific-fit exhaust muffler built for select GM full-size SUVs and trucks. It uses a 3-inch inlet and 3-inch outlet with an oval stainless-steel body to support OE-style sound and steady exhaust flow.

Compatible With 2007-2010 Cadillac Escalade, Cadillac Escalade ESV, Cadillac Escalade EXT, GMC Yukon, GMC Yukon XL 1500, and 2009 Chevrolet Tahoe applications, this muffler is built for direct replacement use on the listed vehicles.

Key Features

• Walker Quiet-Flow SS product line for OE-style exhaust sound
• Specific-fit muffler for listed Cadillac, GMC, and Chevrolet applications
• 100% stainless-steel body construction
• Oval muffler shape with reflection-style internal design
• 3-inch inlet and 3-inch outlet with offset pipe connections
• Aluminized finish
• Overall length: 30 inches; body length: 25 inches; body width: 11.5 inches; body height: 6 inches

Product Details

The Walker Quiet-Flow SS line is engineered for drivers who want a direct-fit exhaust muffler with stainless-steel construction and controlled sound output. Part Number 21684 uses a reflection muffler design, offset inlet and outlet configuration, and pipe connections sized at 3 inches inside diameter. Its dimensions and fitment profile make it a practical replacement for factory-style exhaust service on 2007-2010 Cadillac Escalade, Escalade ESV, Escalade EXT, GMC Yukon, GMC Yukon XL 1500, and 2009 Chevrolet Tahoe models.

This part cross-references Monroe Shocks & Struts (e.g., 20757529, 20757530) for the same application.

Common Exhaust Issues It Can Address

• Excessive exhaust noise from a worn muffler
• Corrosion-related muffler replacement needs
• Restricted exhaust flow caused by internal deterioration
• Factory muffler damage on listed Cadillac, GMC, or Chevrolet vehicles
• Need for an OE-style replacement muffler with direct-fit dimensions

Installation Notes

Verify the vehicle year, make, model, and exhaust configuration before installation. This muffler uses specific fitment and offset pipe connections, so alignment should match the original exhaust layout on the listed applications. If the vehicle has a welded exhaust assembly, replace all required parts as needed to complete the repair.

Quality Assurance

Walker Quiet-Flow SS mufflers are built with stainless-steel construction and are backed by Walker’s limited lifetime warranty coverage noted for the listed applications.