Walker 21638 Exhaust Muffler

Walker Quiet-Flow SS Muffler for Taurus and Sable

Walker Quiet-Flow SS muffler part number 21638 is a direct-fit exhaust muffler built for specific Ford and Mercury applications. It combines stainless-steel construction with an OE-style sound profile and a precision-fit layout for service replacement on select Taurus and Sable models.

Key Features

• Specific-fit exhaust muffler for confirmed vehicle applications
• 100% stainless-steel body construction for corrosion resistance
• Oval muffler shape with a combination muffler design
• Offset 2.25-inch inlet with dual 2-inch outlets
• Overall length: 22.75 inches
• Body dimensions: 17 inches long, 11 inches wide, 5.5 inches high
• Aluminized finish
• Walker Quiet-Flow SS product line for OE-style exhaust service

Product Details

The Walker Quiet-Flow SS line is built for drivers who need a replacement muffler that matches factory-style sound and fitment while using stainless-steel construction throughout the body. Part number 21638 is configured with a 2.25-inch pipe connection inlet, offset inlet placement, and dual 2-inch pipe connection outlets, making it a practical choice for exhaust repair on select Ford Taurus and Mercury Sable vehicles. This part cross-references Walker Exhaust 48354 for the same application.

Compatible With 2008-2012 Ford Taurus and 2008-2009 Mercury Sable applications listed below, including Federal and California emission system configurations where specified. Walker 21638 is also referenced by AP Exhaust 40019 and 78285 for the same application.

Common Problems This Muffler Can Address

• Exhaust noise from a worn or rusted muffler
• Corrosion-related failure in the original muffler body
• Restricted exhaust flow caused by internal deterioration
• Factory exhaust sound that has become louder or uneven
• Replacement needs on welded exhaust assemblies during service repair

Installation Notes and Fitment

• Fits 2008-2012 Ford Taurus, N/A; Premium; with Federal Emission System; If welded assembly, replace all required parts; Quiet-Flow SS
• Fits 2008-2009 Ford Taurus, N/A; Premium; with California Emission System; If welded assembly, replace all required parts; Quiet-Flow SS
• Fits 2008-2009 Mercury Sable, N/A; Premium; with Federal Emission System; If welded assembly, replace all required parts; Quiet-Flow SS
• Fits 2008-2009 Mercury Sable, N/A; Premium; with California Emission System; If welded assembly, replace all required parts; Quiet-Flow SS

Verify inlet and outlet sizing, offset placement, and emission-system notes before installation. This muffler uses pipe connections and is not reversible or tunable, so correct orientation matters during exhaust service.

Quality Assurance

Walker Quiet-Flow SS mufflers are engineered with precision fit and stainless-steel construction to support long-term exhaust service on domestic and import vehicles. The manufacturer notes limited lifetime warranty coverage for the listed applications.