So far I've been leaving it on visual only. Sometimes I'm doing fine and just due to bad A.I. will get hit. I'd hate for a race to be ruined from something unrealistic. If it's a stupid mistake or I'm in the wrong place then that makes sense and I deserve it. So I've been scared to put it on at all. But now I'm curious about turning it on. Performance affecting and full damage. What's the difference? What can I expect if I go with "light" damage? I set my career main races to whatever percent makes a ~20 minute race. Sometimes 30 minutes. Is adding damage worth it or will one problem put me out of the race? Does the AI get damage a lot too? Do they drive differently with damage on?