The aFe Throttle Body Spacer is designed to smoothen airflow into your vehicle's engine providing for increases in horsepower, torque, and fuel economy. aFe Throttle Body Spacers are constructed from billet T-6061 aluminum to ensure they last the lifetime of your vehicle. They utilize a unique serrated/helix entry design to increase airflow, while eliminating annoying whistling common with other throttle body spacers.