how much of a performance increase can I expect w/ aftermarket PULLEY?

[cactscool]

there is this greddy pulley kit for sale for around 200$, this is an s13 single cam ka24e btw.

Is it just a waste of money and for looks?

[9240sx]

Greddy makes a pulley kit for the ka?????I dont think they do.Go with a UR or ASP crank pulley if you want to see gains in power.

[Fenvy]

there are lightened pulley, the concept is to reduce rotation mass... like lightened flywheel, wheels, driveshaft etc

there are also ones where the size is different, look into underdrive and overdrive pulley. I think most peopel get underdrive pulley. I don't know which one is which but the concept is to use less power to rotate things like alternator so lesser power (not eletricity, but torque/hp) loss is incurred

[9240sx]

Underdrive is smaller and slows the accesories. For crank pulleys

[Ni2s4s0aSnX]

You might get 4-6 horsepower to the crank.