I got one of these and it works great. I have it plugged into the sig lighter to charge and it streams with no problems.

GOgroove BlueGate Bluetooth Receiver Adds Wireless Audio To Your Car | Lifehacker Australia

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Ti Silver 2007 X5 4.8i
Sport Package
Premium Package
Cold Weather Package
3rd Row Seats
Heads-Up Display
Navagation
Multi-Contour Seats