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I would say it is what another poster said. Possible bearing or something with the turbo if it is that loud once it starts spooling. I can barely hear the turbos spool in my x5M.
As long as its documented OP by the dealer and something does happen ill will, there is nothing they can do other than help and replace..unless the tune has caused some sort of issue.
Ask the tuner who did the software. See if they are familiar with this sound. I have found that some of these tuners or more knowledgeable than your average mechanic.
On another note, are those CF mirror housings you have or are they just painted black?
If CF would love to know of they are complete replacements and where you got them.
Good luck OP.
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