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Walker
Quiet-Flow SSWalker 21521 Exhaust Muffler
| Brand | Walker 21521 |
|---|---|
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Inlet Inside Diameter | 2.5 |
| Body Width | 9 |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 2.5 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 34 |
| Body Height | 7 |
| Body Length | 30 |
| Body Material | Stainless steel |
| Finish | Aluminized |
| Inlet 1 Inside Diameter | 2.5 |
| Inlet 1 Type | Pipe connection |
| Inlet Configuration | Offset |
| Inlet Offset | 1.625 |
| Inlet Type | Pipe connection |
| Muffler Type | Combination |
| Outlet 1 Inside Diameter | 2.5 |
| Outlet 1 Type | Pipe connection |
| Outlet Configuration | Offset |
| Outlet Type | Pipe connection |
| Product line | Quiet-Flow SS |
| Fits | Ford · 61 vehicles |
100% stainless steel. Corrosion-resistant construction for long-lasting exhaust performance.
Quiet-Flow SS design. Delivers superior flow with OE-style sound.
Precision fit. Built for a specific fit and straightforward installation.
Cross-references 1L3Z5230DA for the same application. See all 1.
$139.28Free shipping
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Walker Quiet-Flow SS Muffler for Ford F-150
Walker Quiet-Flow SS muffler Part Number 21521 is a specific-fit exhaust muffler built with 100% stainless-steel construction for corrosion resistance and long-term service. It is engineered for a precise fit, OE-style sound, and steady exhaust flow on select Ford F-150 and Ford F-150 Heritage applications.
Key Features
- Specific-fit exhaust muffler for select 2001-2004 Ford F-150 and Ford F-150 Heritage models
- 100% stainless-steel body construction for durability
- Oval muffler shape with a 34-inch overall length
- 2.5-inch inlet and 2.5-inch outlet with offset configuration
- Combination muffler design for balanced exhaust performance and sound control
- Walker Quiet-Flow SS product line focuses on precision fit and OE-style sound
- Part Number 21521 for easy identification during replacement lookup
Product Details
This Walker Quiet-Flow SS muffler is designed for drivers replacing a worn or noisy exhaust component on a Ford F-150 or Ford F-150 Heritage. The stainless-steel body, oval profile, and offset pipe connections support a direct replacement approach for the listed applications, while the Quiet-Flow SS line is built around controlled exhaust tone and consistent flow. This part cross-references Ford OE number 1L3Z5230DA for the same application.
Common Replacement Reasons
- Exhaust noise from a rusted or damaged muffler
- Reduced exhaust flow caused by internal deterioration
- Fitment issues when replacing a factory-style muffler on a Ford F-150 Heritage
- Need for a stainless-steel replacement on 2001-2004 Ford F-150 applications
- Restoring OE-style exhaust sound after muffler failure
Installation Notes
Fits 2001-2003 Ford F-150, N/A. Fits 2004 Ford F-150 Heritage, N/A. Review the vehicle notes before ordering: some applications exclude Super Crew, and some are listed as Premium. Verify inlet and outlet orientation, offset dimensions, and overall muffler length against the existing exhaust layout before installation. If the original system uses welded assemblies, replace all required related parts as specified by the vehicle notes.
Quality Assurance
Walker Quiet-Flow SS mufflers are positioned as precision-fit replacement parts with stainless-steel construction and OE-style sound characteristics. Part Number 21521 is part of Walkerโs Quiet-Flow SS line for domestic and import vehicle coverage.
This part fits 61 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Submodel | Drive Type | Liters | Cylinders | Wheel Base | Position | Notes |
|---|---|---|---|---|---|---|---|---|---|
| 2004 | Ford | F-150 Heritage | XL | — | 4.6L | V8 | 138.8" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XLT | — | 5.4L | V8 | 157.1" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XL | — | 5.4L | V8 | 157.1" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XL | — | 4.6L | V8 | 120.2" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XLT | — | 4.6L | V8 | 157.1" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XLT | — | 4.6L | V8 | 138.8" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XLT | — | 5.4L | V8 | 120.2" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XLT | — | 5.4L | V8 | 138.5" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XL | — | 4.6L | V8 | 157.1" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XL | — | 5.4L | V8 | 138.5" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XL | — | 5.4L | V8 | 120.2" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-150 Heritage | XLT | — | 4.6L | V8 | 120.2" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | — | 4WD | 5.4L | V8 | — | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | Lariat | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XL | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XLT | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | King Ranch | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XL | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | Lariat | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XL | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XLT | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XLT | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XL | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | Lariat | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XLT | RWD | 5.4L | V8 | 157.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | Lariat | RWD | 5.4L | V8 | 157.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XL | RWD | 5.4L | V8 | 157.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | King Ranch | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-150 | XLT | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | — | 4WD | 5.4L | V8 | — | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | Lariat | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XL | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XLT | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | King Ranch | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XL | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | Lariat | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XL | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XLT | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XLT | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XL | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | Lariat | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XLT | RWD | 5.4L | V8 | 157.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | Lariat | RWD | 5.4L | V8 | 157.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XL | RWD | 5.4L | V8 | 157.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | King Ranch | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2002 | Ford | F-150 | XLT | RWD | 5.4L | V8 | 139.0" | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | — | 4WD | 5.4L | V8 | — | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | Lariat | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XL | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | Lariat | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XLT | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | King Ranch | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XL | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | Lariat | — | 4.6L | V8 | 157.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XL | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XLT | — | 4.6L | V8 | 120.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XLT | — | 4.6L | V8 | 139.0" | N/A | Except Super Crew; Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XLT | RWD | 5.4L | V8 | — | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | XL | RWD | 5.4L | V8 | — | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | King Ranch | RWD | 5.4L | V8 | — | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2001 | Ford | F-150 | Lariat | RWD | 5.4L | V8 | — | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| No rows match your filter. | |||||||||
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
1L3Z5230DA