It's not a matter of "it might affect".... it will absolutely be affected

All lightweight crank pullies completely remove the harmonic dampener. It's a bad idea

:iagree:

Lightened pullies are a bad idea if this a motor that is used for any period of time. Perhaps if they made Titanium pullies that retained the dampener, I would consider it. Otherwise, no thanks. Turboes, Intake/Exhaust, Cams, Tuning are all better options than pullies to me.............