Short Exhaust Header for Chevrolet Silverado/GMC Sierra (1999-2005) with 4.8L 5.3L V8 EngineUncork the true torque potential of your Gen III LS engine and banish those restrictive, rusty stock manifolds for good. Performance Shorty Exhaust Headers for 1999 2005 Chevy Silverado Tahoe & GMC Sierra Yukon (GMT800 4. 8L 5. 3L Vortec) If you drive a GMT800 platform truck or SUV, you know the Gen III Vortec V8s (4. 8L LR4 and 5. 3L LM7) are legendary for longevity, but the factory exhaust holds them back. The stock cast iron "log" manifolds are