Yeah, what BillsGN said. Two plates, one of top of the other, would NOT work as designed. The plate changes distribution, and using two would change distribution even more, to an "untested" and potentially dangerous amount. Might starve the rear cylinders, might run the front cylinders way too lean, but since Jason designed/tested it in the single plate configuration, there's no way to be sure what would happen with two. Very unlikely to be anything good, however.