SuperGreg,
I believe your correct in saying it's no biggie. However, I still don't like hearing it.
I'm going to keep searching for the source of the whistling.

Thanks

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2005 X5 4.8is
Sapphire Black l Black Nappa Leather l Titanium Trim
BMWCCA #379404
http://www.bmwccaeverglades.com/