Twin Turbo EJ20 Subaru Impreza STi Time Attack Project | OnBoard @ Imola & Unique Engine Sounds Drag & Track by turboandstance - June 24, 2021 What you see here is a Subaru Impreza WRX STI powered by a twin turbo EJ20 engine, one turbo for each bank of cylinders. The car has been built by GMC Racing for time attack purposes and is still under development. Watch the video below to see this twin turbo impreza in action, leave a comment and share this beast with your friends. Follow us also on Facebook, Pinterest or Instagram! Leave a comment