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I assume I could just get someone to look over the car and they would let me know what "class" I would need to be in? That part is confusing in the rule book too!


Varies. My region currently leaves it to the driver to figure it although sometimes they will help.

Here's a quick run down:
Stock: Tire size same (or very close) to stock, Rims within 1/2" of stock. Any front sway bar. Any shocks.

Street Prepared: Frame connectors allowed to be welded front and rear with one other attachment point.
Corporate engine swap allowed. Back seat removal may be allowed. Headers allowed, any springs, sway bars, shocks, etc as long as mounted to original points.

C Prepared or Street Mod: If car is modified beyond the above.