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Walker 21758 Exhaust Muffler
Walker Quiet-Flow SS Muffler for Mazda 3
Walker Quiet-Flow SS muffler Part Number 21758 is a direct-fit exhaust muffler for select 2010-2013 Mazda 3 applications. It uses 100% stainless-steel construction, an oval body, and OE-style sound characteristics to support a precise replacement on the Mazda 3 exhaust system.
Key Features
- Specific-fit exhaust muffler for select Mazda 3 models
- 100% stainless-steel body material with natural finish
- Oval muffler body with combination muffler design
- Offset 2-inch inlet with dual 1.75-inch outlets
- Overall length: 26 inches; body length: 22 inches
- Walker Quiet-Flow SS product line focused on fit, flow, and OE-style sound
Product Details
Walker Quiet-Flow SS mufflers are built for domestic and import vehicle applications where a direct replacement is needed. This Part Number 21758 uses a stainless-steel body for corrosion resistance and a specific-fit layout that matches the exhaust routing on compatible vehicles. The offset inlet and dual outlet configuration support the factory-style exhaust path while maintaining the intended sound profile for the 2010-2013 Mazda 3.
This part cross-references Ansa ST1253S for the same application. It also cross-references Walker Exhaust 53899 and 53900 for related fitment references.
What It Helps Address
- Rust or corrosion in the original muffler housing
- Exhaust noise from a worn or damaged muffler
- Restricted exhaust flow caused by internal deterioration
- Fitment issues when replacing a factory-style muffler on a Mazda 3
- Need for a stainless-steel replacement muffler with OE-style sound
Installation Notes
Fits 2010-2013 Mazda 3, N/A. Verify inlet and outlet diameters, offset configuration, and overall length against the existing exhaust before installation. If the original system uses a welded assembly, replace all required parts as needed to complete the repair. Professional exhaust installation is recommended for proper alignment and sealing.
Quality Assurance
Walker Quiet-Flow SS is a stainless-steel muffler line engineered for precise fit and controlled exhaust sound. For this application, the fitment notes list Premium and Limited Lifetime Warranty coverage.
| Brand | Walker |
|---|---|
| Part Number | 21758 |
| Position | Quiet-Flow SS |
| Finish | Natural |
| Universal Or Specific Fit | Specific |
| Shape | Oval |
| Grade Type | Regular |
| Inlet Inside Diameter | 2 |
| Body Width | 11 |
| Inlet Quantity | 1 |
| Outlet Inside Diameter | 1.75 |
| Reversible | No |
| Tunable | No |
| Overall Length | 26 |
| Body Height | 5.5 |
| Body Length | 22 |
| Body Material | Stainless steel |
| Inlet 1 Inside Diameter | 2 |
| Inlet 1 Type | Pipe connection |
| Inlet Configuration | Offset |
| Inlet Offset | 3.5 |
| Inlet Type | Pipe connection |
| Muffler Type | Combination |
| Outlet 1 Inside Diameter | 1.75 |
| Outlet 1 Type | Pipe connection |
| Outlet 2 Inside Diameter | 1.75 |
| Outlet 2 Type | Pipe connection |
| Outlet Configuration | Dual |
| Outlet Quantity | 2 |
| Outlet Type | Pipe connection |
This part fits 8 vehicles. Search below:
| Year | Make | Model | Submodel | Liters | Cylinders | Position | Notes |
|---|---|---|---|---|---|---|---|
| 2013 | Mazda | 3 | 2.5L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS | |
| 2013 | Mazda | 3 | Mazdaspeed | 2.3L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2012 | Mazda | 3 | 2.5L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS | |
| 2012 | Mazda | 3 | Mazdaspeed | 2.3L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2011 | Mazda | 3 | 2.5L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS | |
| 2011 | Mazda | 3 | Mazdaspeed | 2.3L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
| 2010 | Mazda | 3 | 2.5L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS | |
| 2010 | Mazda | 3 | Mazdaspeed | 2.3L | L4 | N/A | Premium; Limited Lifetime Warranty; If welded assembly, replace all required parts; Quiet-Flow SS |
* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
This part directly replaces or is cross-referenced with the following part numbers:
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.