Walker 54990 Exhaust Muffler Assembly - Front

Walker Quiet-Flow SS Muffler Assembly

Walker Quiet-Flow SS 54990 is a direct-fit exhaust muffler assembly built for the front position on select Acura RDX applications. It uses stainless-steel construction and an OE-style layout to match the original exhaust routing while providing a durable replacement for the factory muffler.

Compatible With 2018 Acura RDX, front, and 2013-2017 Acura RDX, front. The Walker Quiet-Flow SS line focuses on stainless-steel construction and direct-fit replacement design for domestic and foreign vehicles.

Key Features

• Part number 54990
• Stainless steel muffler body and stainless steel muffler material
• Oval muffler shape with natural finish
• Reflection-style muffler design
• Center inlet and center outlet configuration
• 3-bolt welded flange inlet for OE-style connection
• Pipe connection outlet
• Overall length: 47.325 in.
• Body dimensions: 9.75 in. wide, 9.75 in. diameter, 14 in. long, 4.25 in. high
• Inlet outside diameter: 2.415 in.; outlet outside diameter: 2.25 in.

Product Details

Walker Quiet-Flow SS 54990 is an exhaust muffler assembly engineered as a direct-fit replacement for the front exhaust position on the Acura RDX. Its stainless-steel body helps resist corrosion better than typical aluminized mufflers, while the OE-style inlet and outlet layout supports a clean factory-style exhaust connection. This part cross-references Monroe Shocks & Struts (e.g., 18220TX4A02) for the same application.

Common Replacement Reasons

• Rust or corrosion in the original muffler assembly
• Exhaust noise from a damaged or leaking muffler
• Broken or deteriorated factory exhaust housing
• Need for a direct-fit front muffler replacement on Acura RDX models
• Restoring proper exhaust routing after exhaust system wear

Installation Notes

Verify inlet and outlet dimensions, flange style, and overall length before installation. This assembly uses a 3-bolt welded flange inlet and pipe connection outlet, so matching the existing exhaust connection points is important for proper fitment. Confirm front-position application on 2013-2018 Acura RDX vehicles before ordering.

Quality Assurance

Walker Quiet-Flow SS muffler assemblies are built with stainless-steel construction and OE-style replacement geometry for long service life in direct-fit exhaust applications.