APR Vortex Generators help to guide the airflow on cars with very steep drop-off angles between the roof and the rear window. Airflow has a tendency to become turbulent as it separates from the surface of the car in this region. This turbulent air causes drag and reduce the effectiveness of a rear wing. The APR Vortex Generator helps to reduce drag and improve the effectiveness of the rear wing by delaying the air flow separation and reducing turbulence.

ALL 2015-2016 WRX & STI models CAN use this vortex generator.

Note that if you have a 7-inch Starlink head unit, it will not fit. However, if you have a 6.2-inch Starlink radio, it will.
2015-2016 WRX
2015-2016 STI
2017+ WRX Premium with STANDARD 6.2" Starlink Radio