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I also got a 2013 X3 28 for about a year and this wind whistling sound has been bothering me. Finally I brought it to the dealership for diagnostics while doing my regular maintenance. Unfortunately, foreman along with their service manager sat on the car and test drove with me and we couldn't reproduce the whistling sound. Even when they test drove for about 30 minutes themselves they didn't hear anything. The funny thing is once I left the dealership it started to come back again!
I think the reason why it didn't whistle was because (1) lack of cross wind during the drive (2) poor highway condition causes excessive road noise that overtook the whistling sound.
I am using tape trying to locate the leak and will probably go back to the dealership few weeks later for another test drive. If I have to I will drive the foreman back home because that route always can reproduce the whistling sound!
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