My buddy has a cr 500 done by him and it flat out rips,looked up his website,and his work is legit,seems to be pretty well known for his work on the cr,so I gave him a call and we talked for a good hour,he said he done a few zillas here and there and was impressed with the motor,thinks he could get some good numbers out of a zilla similar to the cr 500 motors he does,guess im gonna give him a chance