More Power, Better Throttle Response. This easy to bolt-on PowerAid spacer from Airaid was developed to improve throttle response and to unleash the hidden low to mid range torque from your Mustang's engine, with tremendous torque gains seen between 800 to 2500 RPM. Improve Fuel Economy. The Airaid Poweraid Throttle Body Spacer not only improves the power and performance of your Mustang, but with its unique “Helix Bore” design it also maximizes fuel efficiency saving you money at the gas pump. The Helix Bore creates a spinning action to the incoming air to provide superior atomization of the air fuel mixture for better combustion. Billet Aluminum Construction. CNC machined from the highest quality aircraft grade 6061-T6 billet aluminum the Airaid Poweraid Throttle Body Spacer is anodized in a black finish for great under styling and includes all the necessary hardware and instructions for a simple straightforward installation. CARB Certified. Best of all this Airaid Throttle Body Spacer is 50-state smog legal under Carb EO# D-609-3.Application. The Airaid Poweraid Throttle Body Spacer is designed to fit 2005 to 2009 4.6L V8 GT Mustangs with a factory throttle body.