[TrqlessWonder]

FWIW, most regions expect self-policing. In a friendly manner if at all possible (sometimes it's REAL difficult, and sometimes they're consciously cheating, but most of the time they're just as unaware of the rules as you).

"Hey man, fast car! I'm still kinda new at this, so maybe I don't understand something, but I thought those tires weren't allowed in this class?"

vs

"Hey, no fair, you can't have those! I'm filing a protest!!"

One of those makes you a friend. The other makes you an enemy, or at least drives them away. If you're really unsure of how to approach, find a local pro/organizer for how to address it amicably. I think you'll find that they won't even have protest paperwork and/or be willing to hear one. It's a local. Have fun, accumulate seat time, and then start beating others without needing to worry about such things.