Well im gonna get my nst pulley, whats better and safer the 20% crank or the other one?? and also should i get the alt. pulley too whats the benefits of it? thanks

 

if your going to get the supercharger at some point, get the oem diameter light weight crank, if you don't plan on getting a supercharger, get the 20% smaller one, it is even lighter.

now because you are reducing the size of your crank pulley, your alternator will spin slower and create less power, so the 20% overdrive pulley makes it spin faster again so that it makes about the same power it did when the OEM size pulley was there.