aFe Power Silver Bullet 46-34011 Chevrolet Throttle Body Spacer In-house dyno testing resulted in max gains up to +8 HP and +10 lbs. x ft. of torque Precision machined from 6061-T6 billet aluminum Serrated/Helix Combination Design for optimum airflow into the combustion chamber Fits with stock intake and aFe intake 51/54-74201. This product is not CARB exempt at this time and is not legal for sale in California or use on vehicles registered with the California Department of Motor Vehicles.