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Hi.
I'm following this topic very closely. I have a 330i g21 m-pack with the same issue.
The sound is noticeable from very low speeds up to 130km/h. It seems to be a vibration issue from the road, as mentioned, but it does not scale up with increased speed.
In my case its an M pack with 19'' wheels and adaptive m suspension, with Bridgestone Turanza T005 RFT.
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