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Walker 21478 Exhaust Muffler
| Brand | Walker 21478 |
|---|---|
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Inlet Inside Diameter | 2.25 |
| Body Width | 9 |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 2.25 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 29 |
| Body Height | 7 |
| Body Length | 25 |
| Body Material | Stainless steel |
| Finish | Aluminized |
| Inlet 1 Inside Diameter | 2.25 |
| Inlet 1 Type | Pipe connection |
| Inlet Configuration | Offset |
| Inlet Offset | 2.625 |
| Inlet Type | Pipe connection |
| Muffler Type | Combination |
| Outlet 1 Inside Diameter | 2.25 |
| Outlet 1 Type | Pipe connection |
| Outlet Configuration | Offset |
| Outlet Type | Pipe connection |
| Product line | Quiet-Flow SS |
| Fits | Ford · 5 vehicles |
100% stainless-steel construction. Resists corrosion for long-lasting exhaust performance.
Precision fit. Helps simplify installation with an OE-style replacement design.
OE-style sound. Delivers a refined exhaust note without harshness.
Cross-references OSC 2455 for the same application. See all 1.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Walker Quiet-Flow SS Muffler for Explorer Sport Trac
Walker Quiet-Flow SS muffler Part Number 21478 is a direct-fit exhaust muffler for select 2001-2005 Ford Explorer Sport Trac applications. It uses 100% stainless-steel construction for the body and is built with an OE-style sound profile, precision fit, and steady exhaust flow.
Compatible with 2001-2005 Ford Explorer Sport Trac models, this Quiet-Flow SS muffler is shaped as an oval combination muffler with offset 2.25-inch inlet and outlet pipe connections. The aluminized finish and stainless-steel body support long-term exhaust service in a factory-style replacement format.
Key Features
- Walker Quiet-Flow SS product line for OE-style exhaust replacement
- Part Number 21478
- Specific-fit muffler for 2001-2005 Ford Explorer Sport Trac
- Oval combination muffler design
- 2.25-inch inlet and 2.25-inch outlet
- Offset inlet and outlet configuration
- Stainless-steel body construction
- Aluminized finish
- Overall length: 29 inches
- Body dimensions: 25 inches long, 9 inches wide, 7 inches high
Product Details
Walker Quiet-Flow SS is a stainless-steel muffler line built for drivers who want a direct replacement that maintains factory-like sound characteristics while supporting efficient exhaust flow. Part Number 21478 follows the original-style fitment for the Ford Explorer Sport Trac and uses pipe connection ends with a 2.25-inch inlet and outlet diameter. This makes it a practical choice for exhaust repair work where fit, sound, and material durability matter.
This part cross-references OSC 2455 for the same application.
Common Exhaust Issues It Can Address
- Rust-through or corrosion in the original muffler body
- Exhaust noise caused by a damaged internal muffler structure
- Restricted exhaust flow from a deteriorated muffler
- Fitment problems when replacing a worn factory-style muffler
- Loss of OE-style exhaust tone on a 2001-2005 Ford Explorer Sport Trac
Installation Notes
Verify inlet and outlet diameter, offset configuration, and overall length before installation. This muffler uses pipe connection ends and is not reversible or tunable. For welded exhaust assemblies, replace all required related parts so the system aligns correctly and seals as intended.
Quality Assurance
Walker Quiet-Flow SS mufflers are positioned as OE-style replacement components with precision fit and stainless-steel construction. For this application, the listed fitment is 2001-2005 Ford Explorer Sport Trac, and the product is backed by a limited lifetime warranty.
| Year | Make | Model | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|
| 2005 | Ford | Explorer Sport Trac | 4.0L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | Explorer Sport Trac | 4.0L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | Explorer Sport Trac | 4.0L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | Explorer Sport Trac | 4.0L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | Explorer Sport Trac | 4.0L | V6 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
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