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My car makes the same type of noise. I think it is coming from the rear springs moving in the perch. Its kind of a normal noise that I am use to now.
IF it really bothers you... try squirting some WD40 oil in where the spring sits on the rear suspension. I think there are rubber pads you can buy to place between the spring and spring perch/suspension carrier. I have heard one guy over here who lowered his 1er... the rear sat too low so he used the rubber pads from a six series - to slightly raise the rear suspension. I am sure IF you complained to BMW they would know which rubber pads to use as shims.
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