The DynoPort pipe makes good power and torque but at lower rpm's and doesn't allow the engine to over-rev. I've often thought that it would be a good "mild" modification for a sport machine and an excellent modification for a utility machine particularly where you want more low-end torque for pulling.

Too bad we can't see a shoot-out of where the hp and torque is developed and also what the rpm range is of the engine with various pipes. I would not want to be on a DP piped machine racing against an RcR or HPD piped machine with the clutching changes. There would be quite a difference.