Quote:
Originally Posted by ///MB
4. I have a very intermittent high pitch whistle type sound. I have tried everything to make it happen but it's completely random. I think it's usually at slower speeds and sometimes even when I am at a stop. I know it's never going to make the sound when I happen to take it in for service, so this is another one of those quirks I have given up on but does anyone else have something similar?
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I have this as well and it was improved by loosening the exhaust and re-torquing the system. As I understand the headers are reverse flow and come very close to the firewall and the noise you are hearing is an exhaust "whine" at a specific RPM based upon flow.
PM me for more info.
Edit- my dealer had 3 other X5M's in the shop and the noises were similar by car.