Walker 18962 Exhaust Muffler - Rear

Walker SoundFX Direct Fit Muffler for Pathfinder and QX4

Walker SoundFX Direct Fit muffler Part Number 18962 is a specific-fit exhaust muffler for select 2001-2004 Nissan Pathfinder and 2001-2003 INFINITI QX4 rear applications. It is built with aluminized steel for improved service life versus low-carbon steel and is shaped for a clean, OE-style exhaust replacement.

Key Features

• Direct-fit exhaust muffler for rear installation
• Reflection-style muffler design
• 100% aluminized steel body and finish
• Round steel body with 5-inch body width and 5-inch body height
• Single inlet and single outlet configuration
• 2-bolt welded flange inlet for specific vehicle fitment
• 2.25-inch outlet outside diameter
• Mechanical interior joints and spun-locked heads for added durability

Product Details

Walker SoundFX Direct Fit is a product line focused on replacement mufflers that match the original exhaust layout while maintaining a controlled sound profile. Part Number 18962 uses a reflection muffler type and a center inlet/center outlet arrangement to match the listed rear exhaust applications. The aluminized steel construction helps resist corrosion better than low-carbon steel, while the welded flange connection supports a secure exhaust interface. This part cross-references AP Exhaust 54168 for the same application.

Common Exhaust Problems It Can Address

• Rust-through or corrosion in the rear muffler housing
• Exhaust noise caused by a damaged internal muffler structure
• Restricted exhaust flow from a deteriorated muffler
• Fitment issues when replacing a worn rear exhaust component
• Loss of factory-style exhaust appearance on a Nissan Pathfinder or INFINITI QX4

Installation Notes and Tips

Compatible With 2001-2004 Nissan Pathfinder, rear, and 2001-2003 INFINITI QX4, rear. Verify the 2-bolt welded flange inlet and 2.25-inch outlet dimensions against the existing exhaust before installation. Confirm rear-position routing and overall length of 49.5 inches to ensure proper alignment with the vehicle exhaust system. Part Number 18962 is a specific-fit muffler, so matching the listed application details is important for correct installation.

Quality Assurance

Walker uses aluminized steel, mechanical interior joints, and spun-locked heads to support durability and consistent fit. The SoundFX Direct Fit line is engineered for replacement applications where OE-style appearance and controlled acoustics are important.