Performance Header. 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 engine's 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.

• Finish - Stainless
• Year - 04-06
• Model - Chevrolet Avalanche 8.1L;04-05 Chevrolet Silverado 8.1L;04-05 GMC Sierra Truck 8.1L;04-05 Chevrolet Suburban 8.1L;
• Dimension - 25 L x 11 W x 11 H in.
• Item Weight - 22 lbs.
• Tubing Size - 1-3/4-in. Stainless 16-gauge mandrel bent tubing.
• Foot Note - With out; With out EGR;automatic only