Walker 55494 Exhaust Muffler Assembly

Walker Quiet-Flow SS Muffler Assembly

Walker Quiet-Flow SS 55494 is a direct-fit exhaust muffler assembly built for select Lexus GX460, Lexus GX470, and Toyota 4Runner applications. It combines stainless-steel construction with an OE-style replacement layout to support longer service life than typical aluminized mufflers.

The Quiet-Flow SS product line focuses on direct replacement fitment and stainless-steel durability for domestic and foreign vehicles. For buyers searching for a Lexus GX460 muffler assembly or a Toyota 4Runner exhaust muffler replacement, this part number provides a vehicle-specific solution with factory-style flange connections.

• Stainless-steel muffler body and muffler material
• Oval muffler shape with 11-inch body diameter
• Overall length: 52.25 inches
• 2.5-inch inlet outside diameter with 2-bolt welded flange
• 2.37-inch outlet outside diameter with 2-bolt welded flange
• Offset inlet and offset outlet configuration
• Direct-fit OE-style exhaust muffler assembly
• Walker Quiet-Flow SS 55494 application-specific design

Detailed Product Overview

Walker 55494 is an exhaust muffler assembly engineered for direct replacement on 2005-2009 Toyota 4Runner, 2005-2009 Lexus GX470, and 2010-2022 Lexus GX460 applications. The stainless-steel body and muffler construction are paired with welded 2-bolt flange connections to match the original exhaust layout and simplify fitment on the specified vehicles. This part cross-references AP Exhaust 7547 and BRExhaust 280-125 for the same application.

With an oval body profile, offset inlet and outlet, and regular-grade construction, this muffler assembly is built for owners replacing a worn, rusted, or noisy factory muffler on a Lexus GX460, Lexus GX470, or Toyota 4Runner. Walker Quiet-Flow SS 55494 is a practical choice when the goal is restoring exhaust function while keeping OE-style dimensions and connection points.

Common Reasons for Replacement

• Exhaust noise from a corroded or damaged muffler
• Rust-through on the original muffler body
• Leaking flange connections at the inlet or outlet
• Restricted exhaust flow caused by internal deterioration
• Need for a direct-fit Lexus GX460 or Toyota 4Runner muffler replacement

Installation Notes and Tips

Verify flange orientation, inlet and outlet diameter, and overall length before installation. This muffler assembly uses a 2-bolt welded flange at both ends and an offset inlet/outlet configuration, so alignment with the existing exhaust system is important. Confirm vehicle application by year, make, and model before ordering, especially for Lexus GX460, Lexus GX470, and Toyota 4Runner fitments.

Quality Assurance

Walker Quiet-Flow SS muffler assemblies are positioned as stainless-steel OE-style replacements for long-term exhaust service. Part number 55494 is built to match the listed vehicle applications and connection style for a direct-fit repair.