Rev. Dr. Moses P. Lester posted:

Had a drag race today against a Buddy 50 scooter with a Prima pipe. (it's a p. fast scooter if you're not aware, bro) I won. So I'm feeling optimistic.

Bought a copy of this thing http://www.buildandclick.com/html/tuned_pipe.html and ran the numbers on it. It came up with a pipe that seems surprisingly not that aggressive. Meaning the width of the expansion chamber at its widest is not nearly as wide as the Prima pipe on the above mentioned scooter. I thought that was kinda funny. From the reading I've done, it sounded like for peak HP you'd want a diffuser cone with a wide outlet and a baffle cone with a sharp taper. Maybe it depends on port timings which I assume are rather conservative on this bike. But I'm thinking about trying the hydroforming technique on the software's prescribed pipe this winter.