go to circut city and pick up a subaru to universal wiring harness, and then get a universal to whatever HU you have. in my case is was universal to alpine. then there are no splicing of wires. plug your HU into the HU-Universal, then plug the universal into the universal-subi. then basicly slide her right in. easy as pie. take your time youll be fine
You will first need to remove the trim around teh HVAC and 2DIN spots. easiest way i found was to open the cup holder then wedge a flat head behind the trim on the top right corner of the trim and pry it off. its has 4 "clip" holders, one on each corner, just pull carfeully. after you do that, remove the black screws holding in the silver metal part that holds the cover on. remove metal part, unscrew the screws holding in the cover and rescrew the silver part in and slide in the HU.