APR Performance Rear Diffuser APR Widebody 2004-2007 WRX/STI
**** Fits 04-07 WRX / STI APR Widebody Bumper Only***
Diffusers work in conjunction
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.