zr580's rule you are right my 500 had 93 hp ,here's the thing ,I can get the guy that had it to prove this, but the 500 would and did many times stock for stock outrun a 97 zr 580 he never got by me,and a 97 sx 700 to 80 mph.when I was done tuning the 500 the 700 yammy couldn't catch me till 85 mph.now dont start bashing me saying there is no way possible,there is a way ,remember the spinning problems those 700's had when they were new.as for the cat I dont know only but to say I did beat him every time we raced and he will tell you that.as for the g.t. it will hook up good with the long track but it does require more hp to get it going and keep it going.