2016 (MY) Subaru WRX STI2.5-litre turbo boxer four-cylinder221kW and 407NmSix-speed manual, all-wheel drive0-100km/h in 5. 2s seconds (as tested)For years Subaru’s rally-bred WRX has been the king of the all-wheel drive, race-track-ready, affordable sports sedan arena. How does the 2016 WRX STI Premium shape up in this more competitive world?