I'm in the same boat, bought a CPO 2011 X5 for a tow vehicle and miss some of the toys my M3 had. I bought the bluetooth transmitter mention in one of the earlier replies and it works reasonable well as a speaker phone and music device. You obviously can't control your phone from the car controls but it works fine with a suction holder on the window.
The other change I made was adding a Fiio E11 headphone amp between my ipod and the audio input in the center console. I also bought the Bavsound speakers and between them the audio is greatly improved.
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