I had a similar issue but just to clarify, mine was not RPM dependent and sounded like a loose nut that was about to fall off of something! Very noticeable. Turned out it was the passenger side adjustment nut on my adjustable panhard bar. Just throwing this out there in case it can help anyone else. It haunted me for a while before I figured out what it was.
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2012 GT/CS KB2.8LC 596/487
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