Welcome to the site. Not to be rude, but there are MANY topics on this subject through out this page. It just takes a couple minutes of your time.

I did 2 minutes worth of searching on got this:
http://srt-6.com/knowledge/scpulley.html

https://www.crossfireforum.org/forum...-failures.html

https://www.crossfireforum.org/forum...rt-6-best.html

https://www.crossfireforum.org/forum...y-failure.html

It is also a good idea to get a tune with your new pulley to maximize the power.