I wouldn't bother taking a car that runs 11.40s to a track without a roll bar. As long as you don't tell them the car runs faster than 11.49 you probably will get 1 pass. If your just slightly faster than the 11.49 that requires a roll bar you may get a warning to slow the car down. If you blast a 10 second pass they probably going to tell you to pack it up for the day. Newer cars are allowed to run 10.0s without a roll bar. I think its 2012 and newer cars but I could be wrong. This is because of the way they are designed and structured. Also once you hit the 10.99 mark you need more than just a roll bar. Aftermarket axles, flexplate, harmonic balancer, transmission shield, racing jacket and I'm sure I"m missing something else.