Im sure this is a stupid question, but is it necessary to install underdrive pulleys for the p/s, and the alternator. Or are the main results going to come from the crank pulley?

 

The crank pulley.. Most of the power is from weight savings on the crank. Next is how much the under drive is on the pulley which slows down the alt, and power steering pulley rotations. So there is really no point to change the pulleys it's simply for looks and maybe 1 hp lol