If you're going to be racing in a certain class or spec then you should be checking those rules to make sure that whatever you do falls within their specifications or you won't be able to compete.
Honestly, for Auto-X you don't need anything, if you end up doing something that makes any bracing you put in help survive a crash, you probably did something very wrong.
Honestly, for Auto-X you don't need anything, if you end up doing something that makes any bracing you put in help survive a crash, you probably did something very wrong.