The S204 is a special series produced by Subaru with 600 copies exclusively made for Japan. From a mechanical point of view, the Impreza STI S204 has a new electronic control unit, modified pistons and crankshaft as well as a new exhaust line. The 2L engine now pushes 320hp. Visually speaking, the BBS rims of this Subaru Impreza STI S204 give it a nice distinctive look. In the cockpit, an exclusive steering wheel, new seats and a plate with the number of the car.