Improve Engine Performance. Unleash your V6 Mustangs hidden power with a SR Performance Throttle Body Spacer. The SR Performance throttle body spacer increases plenum volume to improve the low to mid range torque from your Ponys stock 4.0L engine, with noticeable gains seen between 800 to 2500 RPM.Better Fuel Economy. The SR Performance Throttle Body Spacer not only improves the performance of your Pony, but with its unique “Spiral Bore” design it also improves fuel efficiency. The Spiral Bore "spins" the incoming air for improved atomization of the air fuel mixture for better combustion.Billet Aluminum Construction. CNC machined from high quality billet aluminum the SR Performance Throttle Body Spacer includes all the necessary hardware required for a simple straightforward bolt-on installation.Application. The SR Performance Throttle Body Spacer is specifically designed to fit the 2005-2010 4.0L V6 Mustangs with a factory throttle body installed. No tune required.