http://www.e90post.com/forums/showthread.php?t=85149
The factory retrofit is expensive and convoluted. (See above)
also I don't think the audio is as good.
Yes a2dp is streaming bluetooth music.
If you just want Ipod I think BMW does it for around a grand at the local dealerships. I think they will tell you usb isn't possible on some of the older models even though it is . What you want is in the threads try doing a search for USB and 6fl.
http://www.e90post.com/forums/showth...&highlight=6fl