Yea, there has been a few TR's on the show. I don't remember specifics as to what episodes, but your answer is yes.
I think it was last season, a GN made it into the the all-out 8, or maybe even the final 4, but he messed up and forgot to set the trans-brake. When he started to build boost he moved forward & was disqualified. Too bad, because he was kicking-ass & taking names. He had excellent reaction & a fast car (obviously). I think he could have won it all.