I have just purchased a 2006 M Roadster with premium sound and navigation; however, it has not been pre-wired for SiriusXM or an AUX jack. Is there a good way to add on of these features without altering the appearance of the BMW? Can the SiriusXM radio interface with the Navigation screen or/and AUX device could be connected though the bluetooth?
you might want to look into a DICE media bridge. I have it for my e46 m3, and it does the job well. basic BT (answering calls), ipod, aux, and you can get sirius for it too. i would check amazon for prices.
If you do go with the DICE Media Bridge, I would go with Bavarian Sound Werks. We'll be running a story on the installation of this device in an upcoming issue, probably May.