SUBARU DEBUTS NEW 4-DOOR Impreza WRX STI MODEL FOR 2011. Go to gtchannel.com for more car videos. This will be the first time that the WRX STI has been offered in two body styles (5-door and 4-door). In addition to the new styling, the 2011 WRX STI features heavily revised suspension tuning and lighter 18-inch wheels for even sharper handling.