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Hey did this ever get resolved? I have an M2 and am having a similar issue. The dealership has no clue what's causing the problem and is sending me home again without fixing.
This vibration is a rumble throughout the car. It occurs ONLY under full boost above 3500rpm. It is very obvious at 100kmph in 4th; flooring it generates the rumble.
My thoughts go to motor mounts, charge pipe, or transmission mounts. All of which are hard to assess visually except maybe the CP but they tell me nothing is wrong despite acknowledging the issue.
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///M Power
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