WCFab's 2001-2004 LB7 Duramax Billet Exhaust Manifolds replace the restrictive factory cast parts with high-strength, TIG-welded high-flow billet steel components. These manifolds are exhaust port gasket matched and internally divided for optimal flow with OEM or ported cylinder heads. Outlet locations allow full compatibility with OEM style up pipes and are paired with WCFab's 2" Stainless High-Flow Up Pipes for optimized performance. Includes new gaskets, ARP 12PT fasteners, and assembly lube for easy install. Finished in Black Ceramic Coat rated for 2000 deg F.Manifold replaces the following GM Part Numbers: 12637647, 12624683, 97224587
This Part Fits:
| Year |
Make |
Model |
Submodel |
| 2001-2004 |
Chevrolet |
Silverado 2500 HD |
Base |
| 2001-2004 |
Chevrolet |
Silverado 2500 HD |
LS |
| 2001-2004 |
Chevrolet |
Silverado 2500 HD |
LT |
| 2004 |
Chevrolet |
Silverado 2500 HD |
WT |
| 2001-2004 |
Chevrolet |
Silverado 3500 |
Base |
| 2001-2004 |
Chevrolet |
Silverado 3500 |
LS |
| 2001-2004 |
Chevrolet |
Silverado 3500 |
LT |
| 2004 |
Chevrolet |
Silverado 3500 |
WT |
| 2002-2004 |
GMC |
Sierra 2500 HD |
Base |
| 2001-2002 |
GMC |
Sierra 2500 HD |
SL |
| 2001-2004 |
GMC |
Sierra 2500 HD |
SLE |
| 2001-2004 |
GMC |
Sierra 2500 HD |
SLT |
| 2003-2004 |
GMC |
Sierra 2500 HD |
WT |
| 2002-2004 |
GMC |
Sierra 3500 |
Base |
| 2001-2002 |
GMC |
Sierra 3500 |
SL |
| 2001-2004 |
GMC |
Sierra 3500 |
SLE |
| 2001-2004 |
GMC |
Sierra 3500 |
SLT |
| 2004 |
GMC |
Sierra 3500 |
WT |
⚠️ California Proposition 65 Warning:
This product may expose you to chemicals known to the State of California
to cause cancer or reproductive harm.
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