Product Description
The Walker Quiet-Flow® SS 21423 muffler is engineered to match OE exhaust performance while providing long-term durability through its 100% stainless-steel muffler body, internal drainage system, and precisely engineered acoustic design. Built as a direct-fit, bolt-on replacement, it installs easily with factory-style hangers and pipe routing—no fabrication required.
Its premium construction and louvered tube internals deliver a smooth, factory-quality exhaust tone while reducing radiated noise. This model is designed for GM full-size SUVs and trucks equipped with the 4.8L or 5.3L V8 engines.
Key Features
-
100% stainless-steel muffler body for maximum corrosion resistance
-
Aluminized finish for additional exterior protection
-
Internal drainage system reduces moisture buildup
-
OE-style hangers & pipe routing for direct-fit installation
-
Louvered tubes & domed heads provide factory-style tone and flow
-
Spun-locked heads & mechanical joints resist distortion under heat
-
Lifetime warranty + 90-Day Safe & Sound® Guarantee
Technical Specifications
| Specification |
Value |
| Shape |
Oval |
| Finish |
Aluminized |
| Inlet Type |
Pipe Connection |
| Outlet Type |
Pipe Connection |
| Inlet Inside Diameter |
2.625 in |
| Outlet Inside Diameter |
2.625 in |
| Body Height |
7.000 in |
| Body Length |
24.000 in |
| Body Width |
9.000 in |
| Overall Length |
28.000 in |
| Hanger Included |
No |
| Inlet Location |
Offset |
| Outlet Location |
Offset |
| Inlet Quantity |
1 |
| Outlet Quantity |
1 |
| Material |
Stainless Steel (Muffler Body) |
| Reversible |
No |
| Tunable |
No |
| Fitment Type |
Specific |
| Grade Type |
Premium |
Vehicle Compatibility
Cadillac
Chevrolet
-
Avalanche 1500 (2002–2006) — 5.3L V8
-
Suburban 1500 (2000–2006) — 5.3L V8
-
Tahoe (2000–2006) — 4.8L / 5.3L V8
GMC
Installation & Notes
-
Direct-fit replacement — designed to bolt directly to factory exhaust flanges/pipes
-
No welding required
-
No hangers included — must reuse factory hangers
-
Confirm inlet/outlet pipe size (2.625") before installation
-
Ensure proper orientation: offset inlet → offset outlet
-
Designed for single exhaust systems on GM full-size SUVs and trucks
-
Not reversible — must be installed in correct flow direction
-
Professional installation recommended for best alignment and sealing
-
Compatible with factory heat shields and clearance points
-
Not intended for dual-exhaust conversions
