It really depends on the track.
One we go to doesn't even perform tech and you hand your tech card out the window to a guy before entering the burnout box.
Another does thorough tech and told me not to come back until I had a rollbar after doing a few low 11 second passes.
We have a 6 pt. and it's really not that bad in a street car. I would highly recommend swingout side bars.
I do feel much safer with the bar and the 5 pt harness. We are trapping over 130 mph at times, so that gets sketchy with a lap belt.