Since 1988, Subaru Tecnica International has studied and applied motorsports and vehicle development engineering to upgrade and refine Subaru vehicles — both for professional racing and for thrilling performance on your favorite back road or tricky corner. STI engineers and test drivers spent thousands of hours at the track, on challenging roads, and in the STI garage, tweaking and measuring the performance of the STI S209 until it was worthy of its S-model name.