Check out this post, then. The TCU-based Bluetooth system is about 1/2 the cost of installing a ULF-based Bluetooth system. This installation has been repeated many times since this original post. The BSW kit uses the ULF module for around $700. You can get the TCU parts for around $400. Plus, you do not need to install the eject box with a TCU.

http://www.xoutpost.com/electronics/...i-bus-car.html

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2000 E38 750iL Highline Edition, Upgraded with the lastest 2006 X5 Electronics
MKIV Navigation, 16:9 Display, Bluetooth, TV/Video with Backup Camera, Sirius, and Aux Input