Every Gibson Performance Header is Dyno-tuned and engineered to deliver more usable horsepower and torque at low and mid-range RPM highway speeds. Improves engines ability to breathe and cooler operating engine temperature. Designed as a direct replacement for the factory manifolds, using the stock crossover pipe. They are well suited for lowered and raised vehicles, street and off-road. 50 State Street legal. Meets EPA and CARB requirements. Will not affect the factory warranty. No welding required. Uses OEM style connections. 3/8" Heavy Duty Laser Cut Port Flanges- No Warping or Leaking. Premium Gaskets and Hardware included. Backed by a Lifetime Limited Warranty.
With Out Air Injection; With Out EGR; automatic only.

Fitment:
Chevrolet Avalanche 2500 Base 2004
Chevrolet Avalanche 2500 LS 2005
Chevrolet Avalanche 2500 LS 2006
Chevrolet Avalanche 2500 LT 2005
Chevrolet Avalanche 2500 LT 2006
Chevrolet Silverado 2500 HD Base 2004
Chevrolet Silverado 2500 HD Base 2005
Chevrolet Silverado 2500 HD LS 2004
Chevrolet Silverado 2500 HD LS 2005
Chevrolet Silverado 2500 HD LT 2004
Chevrolet Silverado 2500 HD LT 2005
Chevrolet Silverado 2500 HD WT 2004
Chevrolet Silverado 2500 HD WT 2005
Chevrolet Silverado 3500 Base 2004
Chevrolet Silverado 3500 Base 2005
Chevrolet Silverado 3500 LS 2004
Chevrolet Silverado 3500 LS 2005
Chevrolet Silverado 3500 LT 2004
Chevrolet Silverado 3500 LT 2005
Chevrolet Silverado 3500 WT 2004
Chevrolet Suburban 2500 LS 2004
Chevrolet Suburban 2500 LS 2005
Chevrolet Suburban 2500 LT 2004
Chevrolet Suburban 2500 LT 2005
GMC Sierra 2500 HD Base 2004
GMC Sierra 2500 HD Base 2005
GMC Sierra 2500 HD SLE 2004
GMC Sierra 2500 HD SLE 2005
GMC Sierra 2500 HD SLT 2004
GMC Sierra 2500 HD SLT 2005
GMC Sierra 2500 HD WT 2004
GMC Sierra 2500 HD WT 2005
GMC Sierra 3500 Base 2004
GMC Sierra 3500 Base 2005
GMC Sierra 3500 SLE 2004
GMC Sierra 3500 SLE 2005
GMC Sierra 3500 SLT 2004
GMC Sierra 3500 SLT 2005
GMC Sierra 3500 WT 2004
GMC Sierra 3500 WT 2005
GMC Yukon XL 2500 SLE 2004
GMC Yukon XL 2500 SLE 2005
GMC Yukon XL 2500 SLT 2004
GMC Yukon XL 2500 SLT 2005