The 2004 Subaru Impreza Outback Sport is available as a 4-door, 5-seat wagon. Starting at $19,220, the 2004 Subaru Impreza Outback Sport (M5) 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 27-mpg on the highway. The top of the line 2004 Subaru Impreza Outback Sport (A4), priced at $20,020, is powered by a 2.5L, 4-cylinder engine mated to an automatic transmission that returns an EPA estimated 21-mpg in the city and 27-mpg on the highway.