I've been looking around and I see multiple rules for roll cages. The drag strip I frequent has no rules for roll cages so you can run as fast as you want with no real safety equipment (pretty stupid but most cars run the right safety equipment for their speed). When do I need to put a roll cage in a car? I've seen 11.8 for some tracks. 12.00 for others. Then we have those factory cars that run faster than that with nothing. So if I decided to make my 67 a fast car, whats the lowest ET I need a cage?