I've seen the negative effects of a crank pully on a motor. The oil pump failed due to the design of the lightweight pulleys. Compare one to the OEM pully...

I absolutely do not recommend any change in pulleys, especially on a stock motor. I removed mine as soon as I saw what it can do to a motor. The potential damage is not worth the minimal gain.

Additionally, the turbo/super argument in this instance is compeltely and utterly moot. It does not have anything to do with OEM/replacement pulleys.