Single Pipe Doubts

Dear Ralph:

I’ve heard somebody say that it is nearly impossible to get over 110 horsepower out of an engine with a single pipe. If this is the case, then how are we to believe that the MX Z 670 and SX 700 produce around 115 hp ?

It’s a fact, the MX Z 670 and the Vmax 700 SX both produce a certified 115 (or so) hp. Credit recent advances in pipe designs, mostly due to computer aided design software that allows pipe makers to “test” several different designs in a far shorter period of time.