Towing, from the Subaru website, regarding the optional hitch: Heavy-duty rated at 200 lbs. tongue weight and 2,400 lbs. towing capacity. Ball not included. Trailer brakes may be needed.
Towing: 2012, 2011, 2010, 2009, 2008, 2007, 2006, 2005: 2400lbs with trailer brakes, w/o brakes 1000lbs, Hard towing 1000lbs. 2004, 2003 automatic trans 2000#, manual trans 2400#. 2002, 2001, 2000, 1999, 1998 2000#
Clearance: 8.7 inches
Impreza: Is available as a 5 door (mpg=up to 27/36); There is also the Impreza WRX 5-door; no towing capacity.