I got my lightning from a ford dealer. the owner before me installed upper and lower pullys which give out 6 more lbs of boost. i was wondering if it was possible to know what # pullys i have or is there lots of possibilitys?

 

You need to measure the upper and lower pulleys.
Stock is 2.93 2lb upper is 2.8
Stock lower is 7.5" 8" = 2lbs 8.5" = 4lbs