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The noise you only hear at start-up is the exhaust pipe rubbing against a bracket about the middle of the car. The shaking is the same it's been since 2016, it is a result of the design.
On a side note, I now have approx. 30 track days on my M2. The MPE is a good big louder now than when new. I believe the packing starting to get some wear, sounds awesome!
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