I think you have a problem in your car!
I drove an X1 s20d in the highway for about half an hour and there's no anoying noise as you say.
In Portugal, Turbo magazine made a noise test and X1 has better insonorization than an Audi Q5 and Volvo XC60.
I think you should go to your dealer and repair the problem of you car.
The mirrors are big but i didn't notice any extra noise than other BMWs.
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