I sent an e-mail to the following at BMW:
Anthony.Cavanaugh@bmwna.com,
Rich.Powers@bmwna.com,
Shaun.Bugbee@bmwna.com,
Bernhard.Kuhnt@bmwna.com,
customerrelations@bmwusa.com
Complaining about the detuned exhaust note. Just spoke with a representative who informed me that it was a "regulatory change", and there was no way to A) roll back to an earlier iDrive version, B) coming to all "M" model cars.
I have requested a monetary credit to help offset the purchase of the MPE for my 2020 M340I.
I would suggest anyone having the same issues to do the same. Very quick turn-around, less than 6 hours.