Just to clarify for what that rubber ring is for, it's to balance the pulley it's self. I wouldn't doubt it's to assist N/V/H as well, but we all know our engine is not the silkiest around.
Kyle @ Stillen asked Nissan engineers about it on an old thread
"This is a harmonic dampener of sorts, on that point you're exactly right. But it's not to balance the engine, it's to balance the pulley ITSELF."
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Old Car:GTM TSC'd 550whp / 410lbft tq @ 11.88PSI
New Car: Under Construction
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