[Super Bleeder!!]

Vibes are a COMPLEX subject. Suffice it to say, yes the rubber coupler on a stock crank pulley is designed to absorb certain destructive frequencies. Factories are out to save money, they wouldnt put it on the car if it wasnt worth the effort vs using a solid cast piece.

That said, i've been running a fluidampyr for going on 4 years now.