I have this XM Radio that came installed on my car, I had it removed before I even drove off the lot and had sirius put in. But the dealer let me keep it, so if anyone is looking for an XM Radio that works for A4 2004 and A6 2004 (I think) I'm selling it for 210$, which is 100 less than retail, shipping included. The part # 8E0 035 593 A. If your interested email me at cjalian@chabcorp.com. Its still in the factory box! Just email me and we can work out pricing, shipping etc.