I've done a little work on my '97 Outback.
AudioFormz Twisted enclosures with Polk MOMO 650 speakers on the tower, and 4 more matching 6.5's in the boat.
Tower is wired via a Speakeron cable with quick-connects:
Two Phoenix Gold Octane-R amps (5ch and 4ch) behind the passengers seat:
I don't have pics of the finished sub, but it sits under the dash starboard side. I'm working on a nice fiberglass/carpeted trim panel for it.
Also put in a second battery (Optima) with a Perko switch, an iPod mini-stereo connection to the Eclipse head unit, an iPod mount on the dash.