I'm looking into buying a 3 piece pulley set, but I'm not sure to go with either underdrive or stock diameter. My engine has a spacer, intake, and thats about it. I do plan on going turbo by the end of the summer.

What is the difference between the two? Which one would be better for my set-up? I have brand new belts waiting to be put on, would I be able to still use these?

Thanks

 

Forced induction and light weight pullies do not work together. It can mess up your crank case and cost you over 2000. F.Y.I.

 

Thanks for the info...I decided not to go with them anyway.