Unaltered 2008 OEM model year and newer production cars running slower than 9.99 and 135 mph do not have to meet the requirements and specifications for the Summit Racing Series except for the following: Convertibles and T-tops must meet Summit Racing Series Roll Bar and Roll Cage requirements
The wording of the rules may present a problem. Until someone speaks to a race official at a dragstrip who is responsible for enforcing these rules, we can't yet assume you can just show up at the track and run faster than 11.50 without a roll bar.
Here is a thorough discussion on the topic with some experienced NHRA racers. http://www.s197forum.com/forum/showthread.php?t=93516