Hey did you figure this out?
I'm having the same problem, except at ~5500 rpm.
Happens in neutral under zero load, or during a pull under load.
I think it's even being picked up as knock.....and if so I've been chasing this for a couple of years now thinking it was other things.
SR20DET trans / 6 Puck ACT HD / Fidanza Flywheel.
Driveshaftshop AL Driveshaft - but since it's happening in neutral that shouldn't matter either.
Just noticed this last night so any help would be appreciated.
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