I currently have an F36 Gran Coupe and I will be ordering a G20 soon. My GC just has the standard audio which I find adequate. This time round I was going to add HK, but having read these comments, I'm not so sure.
I had an E46 coupe many years ago and that had the HK system which seem to have buzzing/rattling speakers.
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Current: G20 330i M Sport
Previous BMW's:
F36 420i Gran Coupe M Sport; Z4 Coupe 3.0si M Sport; E46 325i Sport coupe;
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