I have an extra wiring harness for subarus. It plugs into your stock wiring harness then has pig-tails to tap off of for your aftermarket stereo. I'll have it at Firestone on Friday. If you want it, bring me a Red-Bull or something.
BTW, first person to post here saying they want it will get it. That way 10 peeps don't show up at Firestone with RedBull thinking they are getting a free harness.