aFe Power Silver Bullet 46-33002 Ford F-150 Throttle Body Spacer Precision machined from 6061-T6 billet aluminum Serrated/Helix Combination Design for optimum airflow into the combustion chamber Only works with aFe intakes part number 51-10512, 54-10512, 51-80512 and 54-80512. Includes all hardware This product is 50-state legal (CARB E.O Number D-550-11)