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 - 99-01
• Model - Chevrolet Silverado 4.8L-5.3L;99-01 GMC Sierra Truck 4.8L-5.3L;99-00 Chevrolet Silverado 6.0L;99-00 GMC Sierra Truck 6.0L;00-01 Chevrolet Suburban 4.8L-5.3L;00-01 Chevrolet Tahoe 4.8L-5.3L;00-01 GMC Yukon 4.8L-5.3L;00-01 GMC Denali 4.8L-5.3L
• Dimension - 25 L x 11 W x 11 H in.
• Item Weight - 21 lbs.
• Tubing Size - 1-5/8-in. Stainless 16-gauge mandrel bent tubing.
• Foot Note- With air Injection; Includes Flat Flange/Ball Seat Flange; With EGR Fitting