Thanks for the ideas. So here's what I'm thinking -- I'll port the 30mph cylinder, start with the stock pipe, then later add a ninja G3. But I'm still wondering a couple of things.
Will the 16.16 sha I already have be OK?
Would an air box be different than the air filter that comes with either the 15.15 or 16.16? If it is, is there somewhere in the wiki that suggests how to design one?
Should I do this to the 50L with the Dimoby (a very 70's orange if it makes a difference to your thinking -- and I have the matching leg skirts) or on the variated 50V (blue)?
Thanks again for the help.