I was looking at what setup I need to make to run at BUB in various classes versus Maxton and think I have it figured out. Let me know if I am wrong on these assumptions.
Internal changes to stock mufflers disqualify a chassis from P class. Does not take you out of P engine class though. Also looks like airbox changes apply to chassis class versus engine class.
Machine work on the head and cams, jetting, etc... is allowed in the P Engine class but changes to non-stock heads, jugs, and carbs, put you in AG or AF. Assuming piston and valve changes are legal in P though.
For P chassis... easy to change on-site, but not clear on mirrors and signals on stalks attached to fairings. Also not sure about the Woodcraft clip-ons for my EX500 but I believe they mount to factory attachment points so legal. This is all for next year and hopefully watching tech this year will get me straight across the board, if possible!