Throttle body spacers are bolt-on truck parts designed to increase the velocity of the airflow into the intake manifold. These throttle body additions provide torque gains to create turbulence that mixes the air/fuel charge and amplifies your truckâ€™s engine performance. By increasing the velocity of air your truck increases horsepower and throttle response while increasing fuel efficiency. Performance Truck Products is a world leader in performance part sales and distribution because, like you, weâ€™re high performance truck enthusiasts. Have a question or concern? Contact us. Shop here for all your aftermarket truck accessories and parts.