I am going with some sort of forced induction in the next six months. My question is, will underdrive pullys prevent me from supercharging?

 

Underdrive pulleys will cause the supercharger to lose boost. Since, the crank pulley will be smaller it will turn the supercharger compressor slower, making you lose presure. So a 7psi kit may only be 5psi with the under pulleys.