The AirAid PowerAid Throttle Body Spacer greatly improves the low-end torque and horsepower characteristics of your engine by spacing the throttle body one inch and adding a Helix style bore(s). As the intake air passes through the spacer, the Helix bore creates a vortex action that improves atomization, creating a more complete combustion and an efficiently burning engine. Results are improved drivability and increased fuel efficiency. Legal in all 50 states. Will not void your new car warranty and can be used with any grade fuel.