Rough Country - 1196 - Throttle Body Spacer for Chevrolet: 99-06 Silverado 1500 4WD/2WD; GMC: 99-06 Sierra 1500 4WD/2WD FEATURES: Easy bolt-on installation; Improved torque performance; Increased fuel economy NOTES: Only fits models with 4.8L, 5.3L, or 6.0L Vortec engines; Not for use in California pending Air Resource Board exemption KIT CONTENTS: Throttle body spacer, gaskets, cable brackets, and hardware SPECS: Installation Time: 1-2 hours; Weight: 1.6-lbs FITMENT: Chevrolet: 99-06 Silverado 1500 4WD/2WD; GMC: 99-06 Sierra 1500 4WD/2WD