Originally posted by BaxterC
looking at this pipe, I would say this pipe would be for bottom to mid range, I could be wrong, as it is a picture, but this is what I would say looking at the angle of the divergent and the lengthof the belly.
I think you would be right on this one.
Usually "fatter" pipes with a short divergent section are good for lower RPM, and "skinny" pipes with long divergent section are good for higher RPM.
Take a look at the pipes use for nitro boats. Usually they are very long and have a mild taper. These boats are designed to run at top RPM mostly all the time.
Glenn Cauley
Ottawa, Canada