I have been thinking of getting a underdrive pulley (34%). Alright but this is were I am stumped It comes with a overdrive Alternator pulley. And I got to thinking if you put on the overdrive pulley along with the underdrive wont they just cancel out.(back to stock just smaller pulleys) I don't see how you could get performance out of it with both on. Can anyone explain????

 

dont waste your money on pulleys. There not worth it. Spend your money on something else that will give true horsepower. I had them and eventually removed them because they really didnt change my horse numbers.

 

I second that. pullies are kinda like the airfoil