The 2004 Subaru Impreza is available as a 4-door, 5-seat wagon. Starting at $19,520, the 2004 Subaru Impreza 2.5RS (M5) Sedan is powered by a 2.5L , 4 -cylinder engine mated to a manual transmission that returns an EPA estimated 21-mpg in the city and 28-mpg on the highway. The top of the line 2004SubaruImprezaWRX (A4) Wagon , priced at $ 25,120 , is powered by a 2.0L , 4 - cylinder engine mated to an automatic transmission that returns an EPA estimated 19-mpg in the city and 26-mpg on the highway.