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aFe Power 46-34019 - 07-13 Chevrolet Silverado 1500/GMC Sierra 1500 Silver Bullet Throttle Body Spacer - Silver coupon_3 Air Flow Research 8000-1 -aFe Power 46 34019 07 13 Chevrolet Silverado 1500 GMC Sierra 1500 Silver Bullet Throttle Body Spacer Silver Silver Bullet Throttle Body Spacer Kit GM Trucks 1500 07 13 V6 4. 3L The serrated helix design creates air turbulence in the intake manifold. This turbulence increases the air pressure in the combustion chamber, resulting in increased performance and improved throttle response. The serrated helix combination design also reduces intake whistle