where can u get this new pully kit?

http://www.pulleyboys.com/nissan.html

If I could do it again I would get the quick change. The pressed on one was a PITA to get off. I did not buy the puller tool WHICH IS A MUST and decided to fab and weld up my own. It worked but man is this thing on there.

It does make a big difference, you can feel it, but by no means does it turn your X into a rocket. The 2.3" takes your truck from 4lbs to 10lbs of boost.