INSANE DRIVING Subaru Impreza WRX STi GC8 on Track! – LOUD Turbo Sound ft. External Wastegate! Drag & Track by turboandstance - November 21, 2018March 12, 2019 That driver definitely knows how to take his Subaru Impreza WRX STi GC8 to the limit! More than 400HP and an external wastegate for the EJ20 boxer engine. Properly tuned by the Italian Subaru specialist Preparazioni Soretti! Thumbs up for that sound! Watch the video. Leave a comment