Quote:
Originally Posted by Michael_s
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.
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Great, thanks. I'll be sure to suggest it to the shop foreman when I take it in next week. I'm always stressed and worried that I will get the car back with the dreaded "could not duplcate" answer.