Saw this over on TUAW, and checked out the video. Very slick install in a Subaru WRX, and everything is actually pretty easy. Full details on the install and the components are written up on the guy’s site. Do check it out.
I would so this, but the newer Subaru Legacy GTs have an integrated fascia with the HVAC and radio all nicely sculpted. Great for aesthetics, horrible for hacking.