I have a similar issue. I just bought a 370z with a GTM supercharger, and what I believe is a Tial QRJ. I get fluttering when I'm cruising at 5% throttle. Pretty sure my issue is I need a stiffer spring.. I still hear tons of air being expelled from the BOV when I should hear it.
Any chance you have a friend with a spare BOV that would fit your flange?
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