On my new M4, the dash started a really nasty buzz after a few thousand miles. The wife and I were on a road trip and she asked, "and you paid how much for this thing?" It was horrible. I wasn't going to make a special trip to the dealer just for that, as noted, sometimes the car comes back worse. In this case, it resolved itself. Seriously... as the car settled in and got more miles, the noise went away.
That's always the best option, when it happens.
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Current inventory:
F22 & G05
Cadillac CT5-V Blackwing w/3 pedals
Past: E24,E28(3),E34,E36,E37,E38(2),E39(4),E46,E89,E92 (obviously),F01,F06,F10,F30,F87,G12,G30(2),G82(2)
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