Our throttle bodies are made entirely from billet aluminum and are designed to supply the proper amount of volume while maintaining the ideal air speed. This insures maximum efficiency while providing maximum power output. Please note that we require your stock throttle body to transfer all of the electronic throttle components to your new throttle body. Under extensive testing we have decided to use proprietary 8.4 gram per-second injectors. This size and design supplies the proper amount of fuel to the Leading Edge 151ci kit. These injectors are included with our throttle body kit.