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If you have to go through that much effort to hear something, i wouldn't worry about it.
In my experience with all of the M cars i've owned, the engines usually omit a bit of noise, such as ticking sounds. Obviously when noises are particularly audible and noticeable you will need to get that checked out, however in your case - if you have to strain to hear it and you don't have any performance loss or check control warnings, then don't worry about it. Just mention it at your next scheduled service if you are concerned.
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