2015 Subaru WRX STI The WRX STI was launched with a pedigree behind. The car was known both on the streets and on the tracks. The air-scoop on the hood was typical for the Impreza and it was kept. Narrower headlights flanked the Subaru hexagonal grille. It was a more powerful stare thanks to new standard LED headlights. Under the hood features a turbocharged EJ25 boxer-four engine that features a spectacular exhaust note.