I would think the Ariel Atom has a good enough roll bar, as well as the Ultima. But ummm Bob.... we don't really get those cars. The Atom can be had but is not road legal, so you have to trailer it to the track.
I think this has been said 1000 times, your in for a shock, corolla's and civics are about the only thing you see on the road here

Oh and yes it fits under the top.