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Walker
Quiet-Flow SSWalker 21447 Exhaust Muffler
| Brand | Walker 21447 |
|---|---|
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Inlet Inside Diameter | 3 |
| Body Width | 9 |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 3 |
| Outlet Quantity | 1 |
| Reversible | No |
| Tunable | No |
| Overall Length | 31 |
| Body Height | 7 |
| Body Length | 26 |
| Body Material | Stainless steel |
| Finish | Aluminized |
| Inlet 1 Inside Diameter | 3 |
| Inlet 1 Type | Pipe connection |
| Inlet Configuration | Offset |
| Inlet Offset | 2.625 |
| Inlet Type | Pipe connection |
| Muffler Type | Combination |
| Outlet 1 Inside Diameter | 3 |
| Outlet 1 Type | Pipe connection |
| Outlet Configuration | Offset |
| Outlet Type | Pipe connection |
| Product line | Quiet-Flow SS |
| Fits | Ford · 36 vehicles |
Stainless-steel construction. Corrosion-resistant muffler body for demanding exhaust environments.
OE-style sound. Delivers a controlled exhaust tone with a precision-fit design.
Quiet-Flow SS line. Walker’s stainless exhaust series for specific-fit replacement applications.
Cross-references Catco 2506 for the same application. See all 1.
$170.94Free shipping
In stock · usually ships same day before 1pm CST
Step 1 — Confirm fitment
Free return shipping if it doesn't fit when you check fitment here first.
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
Step 2 — Quantity
Free shipping to the continental U.S.
Free returns within 60 days if it doesn't fit when fitment is verified.
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Walker Quiet-Flow SS Muffler
The Walker Quiet-Flow SS muffler, part number 21447, is a specific-fit exhaust muffler built for select Ford Super Duty applications. It combines stainless-steel construction with OE-style sound and precision fitment for a direct replacement approach.
- 100% stainless-steel body for corrosion resistance.
- Oval combination muffler design with 3-inch inlet and outlet connections.
- Offset inlet and outlet configuration for application-specific exhaust routing.
- Quiet-Flow SS product line focused on precision fit and controlled exhaust tone.
Fitment Details
Compatible With 2003-2004 Ford F-250 Super Duty, N/A, with Wide Frame; Premium; Quiet-Flow SS.
Compatible With 2003-2004 Ford F-350 Super Duty, N/A, with Wide Frame; Premium; Quiet-Flow SS.
For Ford F-250 Super Duty and Ford F-350 Super Duty applications, part number 21447 is listed with a wide-frame note and welded-assembly guidance in the fitment data. Verify exhaust routing, inlet and outlet alignment, and overall length before installation.
What It Helps Address
- Exhaust noise that needs a controlled OE-style sound.
- Corrosion concerns in a stainless-steel exhaust replacement.
- Fitment issues on specific Ford Super Duty exhaust layouts.
- Replacement needs for a muffler with offset pipe connections.
Installation Notes
Confirm the 3-inch inlet and outlet dimensions, offset configuration, and overall muffler length before installation. The fitment notes indicate that if the assembly is welded, all required parts should be replaced as needed. This part number 21447 is intended for the listed Ford Super Duty applications only.
Quality Assurance
Walker Quiet-Flow SS mufflers are positioned as a stainless-steel exhaust line with precision fit and OE-style sound characteristics. Part number 21447 cross-references Catco 2506 for the same application.
This part fits 36 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Liters | Cylinders | Wheel Base | Notes |
|---|---|---|---|---|---|---|
| 2004 | Ford | F-250 Super Duty | 6.0L | V8 | 172.4" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-250 Super Duty | 6.0L | V8 | 141.8" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-250 Super Duty | 6.0L | V8 | 158.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-250 Super Duty | 6.0L | V8 | 137.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-250 Super Duty | 6.0L | V8 | 156.2" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-350 Super Duty | 6.0L | V8 | — | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-450 Super Duty | 6.0L | V8 | 165.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-450 Super Duty | 6.0L | V8 | 141.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-450 Super Duty | 6.0L | V8 | 176.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-450 Super Duty | 6.0L | V8 | 201.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-450 Super Duty | 6.0L | V8 | 162.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-450 Super Duty | 6.0L | V8 | 200.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-550 Super Duty | 6.0L | V8 | 162.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-550 Super Duty | 6.0L | V8 | 176.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-550 Super Duty | 6.0L | V8 | 165.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-550 Super Duty | 6.0L | V8 | 141.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-550 Super Duty | 6.0L | V8 | 200.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2004 | Ford | F-550 Super Duty | 6.0L | V8 | 189.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-250 Super Duty | — | — | 137.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-250 Super Duty | — | — | 172.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-250 Super Duty | — | — | 158.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-250 Super Duty | — | — | 142.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-250 Super Duty | — | — | 156.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-350 Super Duty | — | — | — | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-450 Super Duty | — | — | 200.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-450 Super Duty | — | — | 176.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-450 Super Duty | — | — | 162.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-450 Super Duty | — | — | 201.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-450 Super Duty | — | — | 165.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-450 Super Duty | — | — | 141.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-550 Super Duty | — | — | 200.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-550 Super Duty | — | — | 162.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-550 Super Duty | — | — | 176.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-550 Super Duty | — | — | 201.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-550 Super Duty | — | — | 165.0" | Premium; with Wide Frame; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2003 | Ford | F-550 Super Duty | — | — | 141.0" | Premium; with Wide Frame; 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.
Catco — 2506