Yeah but they should be honest, its meant to be a budget competitive class. They mill the heads, different cam, tune, weld steel through rear beam to aid suspension rigidity, etc...
Really the rules are simple, stock motor, automatic, single cam max 2 valve per cylinder. only camber mods to right front wheel.
Alot is in the suspension and air pressures, getting the right amount of coils cut from springs, spring rubbers, brakes
its super fun and would do it again, but its just so hard to justify how easy the car can get totaled out there.