My converted and lightened 62 will turn a menz 23x8 at 7200+, a mezj 22x10 at 7200+ and a top flight pp 22x10 at the same. This is on an abell muffler (loud), soon to have a pipe and I am hoping to gain 600 with no lose of throttle-ability. I should be able to get more according to the $120 dollar pipe manufacturer. So for a $150 dollar conversion (now 4lbs) and a $120 dollar pipe I should have a beast. Not too many engines consistantly pull those numbers, and the engine is just about impossible to destroy. I have been running it at peaked rpm for the last 3 gallons with no lose of compression or power. It is 100 degree's here, I have a big round cowl with little exit area. (didn't feel like baffling this one, I was lazy) They thrive on abuse