roll bar?
It would not be a good idea for people to ride in the back of the car with the roll back in place, unless of course you get a removable horizontal bar. If you do get the removable option, it is not NHRA legal.
You will also have to get the standard rear bars that go through the rear speaker panel if you want people to sit in the back comfortably. This means you lose your rear speakers. I didn't really notice any difference in sound quality with the rear speakers out.

