This is the XM module out of my '05 S4. It has been used for 6 months and is in excellent/like new condition. The reason I am selling it is it is not compatible with the navigation system I just installed. It is compatible with all B6 A4/S4 models. Not sure if compatible with A6/A8 but it might. Contact [email protected] for info/pictures. $225 obo.