The 2009 Subaru Impreza WRX STi is available as a 4-door, 5-seat hatchback. Starting at $34,995, the 2009 Subaru Impreza WRX STi Base is powered by a 2.5L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 23-mpg on the highway. The top of the line 2009SubaruImpreza WRX STiw/BBS Gold Wheels/NAVI , priced at $ 38,795 , is powered by a 2.5L , 4 - cylinder engine mated to a manual transmission that returns an EPA estimated 17-mpg in the city and 23-mpg on the highway.