You don't have iDrive so the options aren't really limited to vehicle specific units and really any aftermarket can go in there. I'm a bit partial to Kenwood, so an example would be the Excelon DMX905S. If you Want to stay with a vehicle specific unit then Dynavin *should be your only choice.
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AC Schnitzer/Eibach/M Performance/RaceChip/Compustar/Drone/BimmerTech/FireTV/Helix/Dynaudio/Micro-Precision/Jehnert/Audiomobile
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