Short Exhaust Header for Chevrolet Silverado/GMC Sierra (1999-2005) with 6.0L V8 EngineMaximize your GMT800 truck's performance with these high flow exhaust headersengineered for 19992005 Silverado and Sierra 6. 0L V8 engines to reduce backpressure, increase horsepower and torque, and improve throttle response throughout the powerband. Free Up Power Hidden in Your 6. 0L V8 The 6. 0L Vortec engine in your GMT800 Silverado, Sierra, or full size SUV is a torque monsterknown for towing capability and reliable power delivery. But GM's