Hi have a similar sound also slightly higher up the rev range. It's more annoying than anything else.
It's like the squeaky rear brake problem I sometimes get. Something to do with the M Performance brakes only. Does not affect the car, just annoying.
One thing I have found on the 118i engine is it is quite rattly generally. However this seems to be the way with modern 4 pots. High pressure fuel systems make them almost diesel sounding when cold.
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