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I took my 2013 X3 35i in at about 1500 miles to get checked out once the whistle noise started. Service rep said it was the turbos and that it was perfectly normal. I pointed out to him that it didn't start till after the break-in period when I was driving more in sport mode. Now I can hear the whistle even in eco pro mode, although I have to admit it's really not that bad.
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