This rear diffuser/wing spoiler fits underneath the rear valance of the 2015-2021 WRX and STI. The purpose is to keep air spilling out from under the car from sticking to the back of the car; the spoiler helps the air to stay in a linear stream for as long as possible, reducing drag.
Plus it looks cool.
Kit includes ABS spoiler blade (molded in satin-black, so there's no paint to chip off), plus mounting brackets and hardware.
Fits all 2015-2021 Subaru WRX and STI.