I got a 75mm BBK and it whistles too. Couple things i did HELP.. but dont get rid of it. First I adjusted my idle so it was around 750-800 Rpm. Made it noticably more quit. Second, clean out you idel air bypass with a heavy cleaner like a purple clean. I read a few post on this in the pass. An old post written by "MrClean" had some info in it as well.
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