Walker 21859 Exhaust Muffler - Right

Walker Quiet-Flow SS Muffler Assembly

Walker Quiet-Flow SS 21859 is a direct-fit exhaust muffler assembly for select Buick Regal and Chevrolet Malibu applications with dual exhaust. It combines OE-style replacement fitment with stainless-steel construction for longer service life than typical aluminized mufflers.

Built for the right-side exhaust position, this muffler assembly is a practical replacement for drivers looking to restore exhaust function and maintain factory-style routing on compatible vehicles.

Key Features

• Direct-fit OE-style exhaust muffler assembly
• Stainless-steel construction for improved durability
• Single inlet and single outlet configuration
• Body-side inlet and outlet layout
• Combination muffler design
• Fits right-side applications on select Buick Regal and Chevrolet Malibu models
• Walker Quiet-Flow SS line focuses on long-life replacement fitment

Product Details

This Walker muffler assembly, part number 21859, is engineered for select 2011-2017 Buick Regal, 2013-2015 Chevrolet Malibu, and 2016 Chevrolet Malibu Limited models in the right-side position with dual exhaust. It uses a 2-inch inside diameter inlet, a 2.25-inch outside diameter outlet tip, and an irregular body shape with an overall length of 22.5 inches. The steel body and aluminized finish support OE-style replacement needs while maintaining a factory-like exhaust layout.

The Quiet-Flow SS product line is Walker’s stainless-steel muffler assembly offering for domestic and foreign vehicles. For buyers searching for a Walker 21859 muffler assembly, this part provides a direct-fit solution for restoring exhaust performance on the specified Buick Regal and Chevrolet Malibu applications.

This part cross-references GM OE numbers 20995713 and 22931698 for the same application.

Common Issues This Part Can Address

• Exhaust noise from a worn or damaged muffler
• Corrosion-related muffler replacement needs
• Factory exhaust fitment loss after repair or replacement
• Right-side exhaust service on dual-exhaust vehicles
• Restoring proper exhaust routing on compatible models

Installation Notes and Tips

Verify the vehicle’s right-side exhaust configuration before ordering. This muffler assembly is listed for dual-exhaust applications and should be matched to the original routing, inlet, and outlet layout. If the original system uses a welded assembly, replace all required related parts during service to ensure proper alignment and sealing.

Confirm fitment by year, make, model, and position before installation. Walker 21859 is listed for 2011-2017 Buick Regal, 2013-2015 Chevrolet Malibu, and 2016 Chevrolet Malibu Limited in the right-side position.

Quality Assurance

Walker Quiet-Flow SS muffler assemblies are built as direct-fit OE-style replacements with stainless-steel construction for longer life than typical aluminized mufflers. This part is backed by the limited lifetime warranty noted in the fitment data for the listed applications.