When it comes to what cars are allowed, the answer is, "almost all of them!"

The Time Trials National Tour does not allow Formula Cars and Sports Racers, but pretty much any production (or production-based vehicle) will be allowed at a Time Trials event. If you're running Track Days, Track Night In America, or Drivers Education events, the rules are virtually the same. Convertibles will need some type of rollover protection (either factory or aftermarket) and if you're on special racing tires (non-DOT) or special competition street tires with treadwear less than 200 you may need more car and driver safety equipment but there will be a competition class for you.