2002 Subaru Impreza Submodel: Outback; Engine: 2.5L H4; Position: Alternator and Power Steering;. 2003 Subaru Impreza Engine: 2.5L H4; Position: Alternator and Power Steering;. 2004 Subaru Impreza Engine: 2.5L H4; Position: Alternator and Power Steering;.