The last time Pro-10 (10th scale modified pan car 6-cell) ran as a national ROAR class was at the Minnreg in Fl. From what I remember Josh Cyrul and Mike Blackstock saying is the cars were just too fast. And that was only with 11 turns. They were just to fast and you just couldn;t drive them smoothly. Even in stock they are a hand full unless they are on a big track. Somewhat the same thing as 12th stock 6-cell, it is even faster the 4-cell mod and just to hard to handle.