Walker 21367 Exhaust Muffler

Walker Quiet-Flow SS Muffler for GM Vans

Walker Quiet-Flow SS muffler Part Number 21367 is a specific-fit exhaust muffler built with stainless-steel construction and an OE-style sound profile. It is engineered for select Chevrolet Express and GMC Savana applications, including 1996-2000 Chevrolet Express 1500, 1996-1999 Chevrolet Express 2500, 1997-2000 Chevrolet Express 2500, 1996-2000 Chevrolet Express 3500, 1996-1999 GMC Savana 1500, 1996-1999 GMC Savana 2500, 1996-2000 GMC Savana 3500, 1997-2000 Chevrolet Express 3500, 1997-2000 GMC Savana 2500, and 1997-2000 GMC Savana 3500.

The Quiet-Flow SS line focuses on precision fit, smooth exhaust flow, and a factory-like sound level. If you are replacing a worn muffler on a Chevrolet Express or GMC Savana, Walker 21367 provides a direct-fit solution for the listed applications.

Key Features

• Specific-fit exhaust muffler for select Chevrolet Express and GMC Savana vans
• 100% stainless-steel body construction for corrosion resistance
• Oval muffler body with a combination muffler design
• 3-inch inlet diameter with offset inlet configuration
• 2.75-inch outlet diameter with offset outlet configuration
• 3-bolt welded flange and pipe connection inlet styles, depending on application
• Quiet-Flow SS product line tuned for OE-style exhaust sound
• Walker Part Number 21367

Product Details

Walker Quiet-Flow SS is a stainless-steel muffler line developed for drivers who want a direct replacement that matches factory exhaust behavior more closely than a universal muffler. This muffler uses an oval body shape, aluminized finish, and a combination design to support proper exhaust routing on the listed GM full-size vans. The fitment coverage includes Chevrolet Express and GMC Savana models from 1996 through 2000, with application notes that vary by GVW and exhaust configuration. For shoppers comparing Chevrolet Express muffler replacement or GMC Savana exhaust muffler options, Part Number 21367 is a cataloged match for the vehicles shown below.

This part cross-references Monroe Shocks & Struts (e.g., 172286, 182286) for the same application.

Common Exhaust Issues It Can Address

• Rust-through or corrosion in the original muffler
• Exhaust noise increase from a damaged internal baffle
• Poor exhaust flow caused by a restricted muffler
• Fitment problems when replacing a worn factory-style muffler
• Need for a direct replacement on Chevrolet Express and GMC Savana vans

Installation Notes

• Verify the vehicle’s GVW and exhaust configuration before ordering, since fitment notes differ by application.
• Some listed vehicles require 55202; confirm the existing exhaust layout before installation.
• For welded assemblies, replace all required parts as noted in the fitment data.
• Check inlet and outlet orientation, including offset measurements, to match the original routing.
• Confirm compatibility with rear-exit or non-rear-exit exhaust setups before installation.

Quality Assurance

Walker Quiet-Flow SS mufflers are built with 100% stainless-steel construction and are part of Walker’s OE-style replacement exhaust lineup. The manufacturer describes this line as offering precision fit, improved flow, and factory-like sound characteristics for domestic and import vehicles. Walker 21367 is listed with a limited lifetime warranty in the fitment notes for the covered applications.