I'm with Ron on this one. A lot of modern factory performance cars are running 12's these days. Granted not every Tom, Dick and Harry are driving one, but they are out there. And after you go through all that work, do you want to get owned by someone in a new all-stock car? No, so that's why I'd say shoot for 11's. Or at least build the combo so the potential for 11's is there down the road.