The rules are very relaxed.... cars 12.00 and slower have been helmet ...regular street car seat belts. Some guys wear shorts in slower cars and it's aloud but I don't recommend it ...for your own personal safety I would say driveshaft loop, change anti freeze to water....check your axles . There will be plenty of people there with tools to assist in any mechanical failures. Cars faster than 11 seconds should abide by NHRA rules. Cages are always recommended at 11.50 or faster but not enforced there. I run faster than that and they have a relaxed the rules for the day