Audio is independent of hands free Bluetooth. Your radio should be aux input ready, and it mye have the aux plug already installed. A generic 3mm audio plug is all you need.

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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