hey guys there are many different types of pulleys out there. for example, ASP Harmonic Balancer Crank Pulley, ASP Overdrive Alternator Pulley, ASP Underdrive Alternator Pulley, and Powerbond 25% Underdrive Crankshaft. which one is required to get and which one is not necessary? also are belts a requirement to get when you buy a pulley? thanks for the info.

 

any of the underdrive pulleys are gonna be the same. the pulley taht goes on the alternator is to reduce the chance of voltage lose due to the alternator spinning slower with the underdrive crank pulley.

you want the overdrive alt pulley if you get it.

the underdrive crank will spin the accessories less and free up some horsepower. you don't have to get the alternator pulley, but if you run a stereo system you'll probably want it