Product Description
The WALKER 21476 Exhaust Muffler is engineered to provide reliable noise reduction and durable performance for a wide range of hard-working commercial vehicles. Manufactured from aluminized steel, this muffler offers enhanced corrosion resistance and long service life, making it a dependable replacement for aging or failing OE components.
Designed to help reduce both in-cab and exterior noise levels, the 21476 supports quieter operation even under continuous heavy-duty use. With multiple configurations available across Walker’s commercial lineup, this universal-fit muffler is built to accommodate common installation requirements with an economical price point.
Whether replacing a worn-out unit or upgrading for improved sound control, the 21476 provides a practical OE-quality solution for commercial fleets, delivery vehicles, and industrial chassis platforms.
Key Features
-
Aluminized Steel Construction enhances durability and corrosion resistance
-
Engineered for Noise Reduction to minimize in-cab and exterior engine sound
-
Universal Fitment supports a wide range of commercial applications
-
Economical OE Replacement designed for long service life
-
Wide Compatibility across domestic and import commercial vehicles
-
Reliable Mechanical Construction for consistent performance under heavy use
Technical Specifications
| Specification |
Detail |
| Shape |
Round |
| Finish |
Aluminized |
| Body Material |
Steel |
| Inlet Type |
Pipe Connection |
| Outlet Type |
Pipe Connection |
| Inlet Inside Diameter |
3.000 in |
| Outlet Inside Diameter |
3.000 in |
| Inlet Location |
Offset |
| Outlet Location |
Offset |
| Inlet Quantity |
1 |
| Outlet Quantity |
1 |
| Body Height |
8.375 in |
| Body Width |
8.375 in |
| Body Length |
29.750 in |
| Overall Length |
36.250 in |
| Inlet Offset |
2.000 in |
| Reversible |
No |
| Tunable |
No |
| Universal or Specific Fit |
Universal |
| Grade Type |
Premium |
Vehicle Compatibility
(Universal fit muffler; listed vehicles indicate known compatible applications requiring one unit.)
Chevrolet
P30 — 3.9L L4 (239 cid)
GMC
P3500 — 3.9L L4 (239 cid)
International
Cargostar — 5.7L V8 (345 cid)
Cargostar — 6.4L V8 (392 cid)
Installation & Warranty Notes
-
Universal-fit muffler—verify sizing and alignment prior to installation
-
OE-style pipe connections for straightforward integration
-
Welding may be required depending on vehicle configuration
-
Inspect clamps, brackets, and hangers and replace if worn
-
Ensure proper clearance and secure mounting to prevent vibration or leaks
