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I've done some research on the different Combox retrofits, and have been told that with the media version, you have to deactivate it before your car goes in for service due to an issue with programming. I'd get the telematics version just to not have to deal with that hassle.
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2011 335D Space Grey, Black Leather Interior, ZSP, ZPP, ZCW, 6FL, Satellite Radio, Nav, Base Audio 
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