Well the only person with a ceritfied cage in a syclone that I know of is charles blossom (the nhra record holder)
Some tracks are more strict then others. You go to a nhra sanctioned event, and you will not be allowed to run. You go to a test and tune night at your local track where you know the tech officials, they might let you slide. They could give a rats ass at the KC nationals.
Most people can get away with a pass or two, then they get booted.
Robert lives in Sweden and by the looks of their tracks, I doubt they have any rules.
take for example the autobahn over there
