Hey nice going. See my link at the bottom. Basically, I did the same thing with dremeling the dash piece (the Impreza and Outback are based on the same platform). I'm curious as to why you spliced into the factory harness instead of getting a cheap adaptor and splicing into that... Jim Hogan here also did a Subie instal (very nice!)

I'm getting alternator whine and think it may be coming from my head unit... are you experienceing that? I guess I could tap into the RCA's and take the empeg out of the equation, but how would I trigger the amp on?