I've got a blitzsafe adapter that works with the cd changer in the cargo area of my 02 AR. It was easy to run the cable to the front in my A4, but it looks a little more difficult to run through the cargo area wall trim in the AR. Anybody have any ideas? Once I get it near the seat back, I'll run it under the seat and have only a little exposed on the drivetrain tunnel. Thanks.

I ran it under the carpet in the hatch area, to the side of the left rear seat (just put the seat down, put it in there and re-latch the seat), under the left rear mat, over the hump (the only exposed area), and under the left side of the passenger seat. I have never had a problem with it and, more importantly, my two kids haven't noticed the cable.

..still a work in progress...but you can see what I did to run a bunch of wiring from my dash to my rear trunk area for the OEM Sirius tuner etc.