To the casual observer, this S209 will look pretty much like every other recent Subaru WRX STI. The name and wing might hint that this is something a bit more special. On the flip side WRX STI fans need no explanation whatsoever. They are getting light-headed at the very fact this car exists at all. This is the water-spray cooled, carbon-roofed, be-winged messiah of their dreams.What is STI again?STI – Subaru Tecnica International – is the standalone unit of Subaru responsible for turning the boring but good Subaru models into something altogether more interesting. Think of AMG or M Sport before Mercedes and BMW brought them in house.A unit of just 120 die-hard tuners, drivers and engineers hell-bent on making their cars go harder and faster for longer on road, rally stage or track.