I want to get the whole set crank and pulley set but says you cannot use both together why is that??? Also if I cant both can use the afx pulley with obx pulleys ( alt and pw )or Which one would give the most performance If I can only put one on...

where did it say you couldn't use them together?

the obx pulley set is an underdrive pulley (udp crank) the others are ovver drive they counter act each other ...

ud gain a little but loose some in the same mannor

would you gain hp by underdriving the acessory pullies?

I wouldn't think it would "counter-act" each other. By placing a smaller pulley on the crank you are adding to it's rotational torque (a smaller circumference pulley would be stronger and spin faster). This would in turn spin your accessories faster causing them to wear out sooner. By adding a larger pulley to the accessories it would slow them down due to it's circumference increasing, and need less rotational torque to spin it, therefore helping them last longer.

You would counter act a UDP by placing smaller pulleys that were directly proportional to the change in your UDP size from factory.

I'm certain that you would be "DOUBLING UP" and possibly starving your accessories of rotation.

Would it be best to replace the crank pulley or replace the accessories pulleys??? Im leaning towards replacing the accessories due to fact that crank pulley needs to be harmonic balanced or it would wear your seals out or something in that range when I looked at another set...drop some info..

either one doesn't mater the udp would probably wage a bigger gain cause u drop 5lbs off of rotating weight with it...