Product Description
The Walker® Quiet-Flow® SS 21904 muffler is engineered with 100% stainless-steel construction, ensuring exceptional durability and corrosion resistance compared to aluminized alternatives. With OE-style hangers and pipe routing, this muffler installs easily and delivers the same smooth, controlled exhaust tone as the factory system.
Internally, mechanically joined tubes, louvered sound-control channels, and domed heads help minimize distortion, reduce radiated noise, and provide premium acoustic performance. Designed specifically for Subaru applications, this unit offers long-lasting reliability and OE-correct fitment.
Key Features
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100% Stainless-Steel Construction for maximum corrosion protection
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Direct-Fit Design – OE-style hangers, brackets, and routing
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Premium Sound Control – Louvered tubes reduce radiated noise
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Durable Mechanical Construction – Handles thermal expansion without distortion
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Flow & Sound Tested – Ensures OE-quality performance
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Backed by Walker’s Limited Lifetime Warranty
Technical Specifications
| Specification |
Detail |
| Shape |
Oval |
| Finish |
Natural |
| Inlet Type |
2 Bolt Welded Flange |
| Outlet Type |
Tip |
| Body Height |
7.000 in |
| Body Length |
13.000 in |
| Body Width |
9.000 in |
| Overall Length |
23.000 in |
| Inlet Inside Diameter |
— (Flange type) |
| Outlet Outside Diameter |
2.750 in |
| Inlet Location |
Offset |
| Outlet Location |
Offset |
| Inlet Quantity |
1 |
| Outlet Quantity |
1 |
| Body Material |
Stainless Steel |
| Hanger Included |
Yes |
| Reversible |
No |
| Fitment |
Specific |
| Grade Type |
Premium |
| Inlet Offset |
1.625 in |
Vehicle Compatibility
Subaru
Installation & Notes
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Direct-fit, bolt-on replacement – installation requires no cutting or welding
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Hangers included – designed to align with factory mounting points
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Not reversible – install in correct orientation per OE layout
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Two-bolt flange connection – ensure gasket compatibility when installing
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Intended for use with factory exhaust system
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Professional installation recommended to ensure proper sealing and alignment
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Check heat shield and rubber isolators for wear before installation