Walker 21366 Exhaust Muffler

Walker Quiet-Flow SS Muffler for Explorer and Mountaineer

Walker Quiet-Flow SS muffler Part Number 21366 is a specific-fit exhaust muffler built for select Ford Explorer and Mercury Mountaineer applications. It uses 100% stainless-steel body construction with an OE-style sound profile and precision fitment for direct replacement service.

Key Features

• Walker Quiet-Flow SS product line for OE-style exhaust replacement
• Specific fit for 1998-2001 Ford Explorer and 1998-2001 Mercury Mountaineer applications
• 100% stainless-steel body material for corrosion resistance
• Oval muffler body with a 31.625-inch overall length
• 2.5-inch inlet and 2.5-inch outlet sizing
• Offset inlet configuration with center outlet configuration
• Combination muffler type with 2-bolt loose flange and spherical flare inlet connection
• Aluminized finish

Detailed Description

Walker Quiet-Flow SS Part Number 21366 is engineered as a direct-fit exhaust muffler for 1998-2001 Ford Explorer and 1998-2001 Mercury Mountaineer models listed in the fitment data. The Quiet-Flow SS line focuses on stainless-steel construction, precise fitment, and an OE-style exhaust note, making it a practical choice for replacing a worn or noisy factory muffler. This unit features an oval body, 11-inch body width, 5.5-inch body height, and 20-inch body length, with a 2.5-inch inlet and outlet path to match the specified exhaust configuration.

The Quiet-Flow SS product line is Walker’s stainless-steel muffler family for domestic and import vehicles, built to deliver consistent flow characteristics and a factory-like sound level. For buyers searching for a 1998-2001 Ford Explorer muffler replacement or a 1998-2001 Mercury Mountaineer exhaust muffler, Part Number 21366 provides a fitment-specific solution with the connection style and dimensions needed for the listed applications.

This part cross-references Anchor 2294 for the same application.

What It Helps Address

• Exhaust noise from a damaged or internally worn muffler
• Rust-related muffler deterioration on the original exhaust system
• Fitment issues when replacing a factory-style muffler on Explorer or Mountaineer models
• Restricted exhaust flow caused by a failing muffler core or housing
• Need for an OE-style sound level in a direct replacement exhaust repair

Installation Notes and Tips

Verify inlet and outlet orientation before installation: this muffler uses an offset inlet and center outlet layout. Confirm the vehicle’s exhaust configuration against the listed fitment notes, including the dual-inlet requirement on applicable Ford Explorer and Mercury Mountaineer models. If the original system is a welded assembly, replace all required exhaust components as noted in the fitment data to ensure proper alignment and sealing.

Quality Assurance

Walker Quiet-Flow SS mufflers are built with 100% stainless-steel construction and are positioned as a precision-fit, OE-style replacement for select domestic and import vehicles. Fitment notes for the listed Ford Explorer and Mercury Mountaineer applications include limited lifetime warranty coverage.