APR Rear Diffuser Ford Mustang S197 2005-2009
Diffusers work in conjunction with other aerodynamic components of a car to help produce down-force. Because a car displaces air as it moves forward, the air molecules in the rear of the car get disrupted causing a vacuum of low pressure air.
To help channel the high speed air flow coming from underneath the car, diffusers redirects the high speed air flow to transition smoothly transition into the low pressure vacuum in the rear. This encourages a smoother flowing air flow underneath the car and allows better performance from other aerodynamic components such as aerodynamic wings.
***Note (will not fit with Roush optional Rear Valance)***