I asked Bob about the whole cage thing when I set it up (there was a possibilty of a mid 9 sec 3S coming) and he said if they’re running under 11.49 then they need one. However I’ve been up there on regular nights and have seen hight 10 sec cars without cages. As long as you’re a street car and not deep into the 10’s/9’s I’m sure you’ll be ok.
Terry