Originally Posted by fadedSTi
maybe a couple hp. it mainly helps you get through the gears alot quicker. you get to your peak power alot quicker.
Exactly.
From what I've read online debating lightened vs. underdriven pulleys....
I hear that there are some re-charging issues with underdriven or smaller diameter pulleys. The economical alternative would be the lightened, but not underdriven, crankshaft pulley. The price ranges from $90-$150 and they can be a couple pounds lighter, but the same diameter which also lets you keep the stock belts, because the underdriven pulleys by nature will need a new set of belts.
-AL-