Walker 54378 Exhaust Muffler Assembly - Rear

Overview of Walker Quiet-Flow SS Exhaust Muffler Assembly 54378

The Walker Quiet-Flow SS Exhaust Muffler Assembly 54378 is designed for reliable exhaust performance on select INFINITI and Nissan vehicles. Engineered with stainless steel construction and a round body shape, this muffler assembly offers durability and effective noise reduction for the Nissan Pathfinder and INFINITI QX4.

• Compatible with INFINITI QX4 and Nissan Pathfinder models
• Durable stainless steel body and muffler material
• Aluminized finish for corrosion resistance
• 2.1 inch inlet diameter with 2 bolt welded flange
• 2.25 inch outlet pipe connection
• Round muffler shape with 5 inch body diameter and 12 inch body length
• Center inlet and outlet configuration
• Overall length of 46.5 inches for precise fitment

Detailed Product Description

This Walker Quiet-Flow SS exhaust muffler assembly (part number 54378) features a combination muffler type with a round shape, designed to fit the center inlet and outlet configuration of the Nissan Pathfinder and INFINITI QX4. The muffler body and internal components are constructed from stainless steel, providing enhanced resistance to rust and corrosion. The aluminized finish further protects the muffler from environmental elements, extending its service life.

The inlet outside diameter measures 2.1 inches and uses a 2 bolt welded flange for secure attachment, while the outlet features a 2.25 inch pipe connection. The body dimensions—5 inches in diameter, width, and height, with a 12 inch length—ensure compatibility with the exhaust system layout of the specified vehicles. The overall length of 46.5 inches allows for proper installation without modification.

About the Walker Quiet-Flow SS Product Line

The Quiet-Flow SS line from Walker is engineered to provide a balance of sound reduction and durability. Utilizing stainless steel materials and precise manufacturing, this product line is designed to meet the demands of regular grade exhaust applications. The Quiet-Flow SS mufflers are suitable for vehicles requiring a combination muffler type with center inlet and outlet configurations, such as the Nissan Pathfinder and INFINITI QX4 models.

Common Applications and Problem Solving

• Replacement for worn or damaged mufflers on Nissan Pathfinder and INFINITI QX4
• Reduction of exhaust noise and vibration
• Improved exhaust flow with proper inlet and outlet sizing
• Corrosion resistance in harsh driving environments
• Restoration of factory exhaust system fit and function

Installation Notes and Tips

• Ensure compatibility with vehicle make and model before installation
• Use proper tools to secure the 2 bolt welded flange inlet connection
• Check for exhaust leaks after installation to maintain system integrity
• Inspect surrounding exhaust components for wear during replacement
• Professional installation is recommended for optimal fit and performance

Quality Assurance and Warranty

Walker exhaust components, including the Quiet-Flow SS muffler assembly 54378, are manufactured to meet industry standards for durability and performance. The stainless steel construction and aluminized finish contribute to long-lasting service life. Warranty coverage details should be confirmed with the manufacturer or authorized distributor to ensure proper protection.