Update; they sent me on my way again. Said it was normal. They seem to be convinced its road conditions. Chatted with an M2 owner who is also a service advisor and he has the same issue. None of this stuff was captured in notes of course but it is interesting. He is suspicious of it being the exhaust. Given how aggressive MPE is, it could be that it's just vibrating at the headers. I'd buy that.
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///M Power
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