I recently purchased a Sirius satellite radio receiver, and I would like to connect it directly to my 2006 Mustang's Shaker 500 head unit. The Sirius receiver has an Audio Out jack, and I was wondering what cord would I need to connect the receiver to the head unit so that I can get perfect quality instead of having to use the FM transmitter from the Sirius receiver. Also what would be the easiest way of getting to the back of the head unit? thanx