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Just had this exact same thought yesterday and was doing some research before I posted about it myself. Piggybacking off some threads by the F30 guys, it seems like it'd need at minimum a new module, front radar sensor, and either a new steering wheel/dash piece or retrofitting those buttons to the existing blanks. They estimated about $1000-1500 in parts before coding, which is a little steep for me. I have a friend here who runs a well-stocked BMW salvage yard that I might be able to source some parts for and do it cheaper, but I'm hesitant to do it before knowing exactly what I need or what the coding would entail.
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