Yup, I do-- I have one in my car. This kit/company is very popular in this BT forum as well as on the Bimmernav Bluetooth forum. Martin (the guy behind Bimmernav) is one of the pioneers behind the Bluetooth retrofit projects for our cars.

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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