I had a black m max box and thought it was de restricted. look here for the reading http://www.bikepics.com/pictures/477092/ the lower figure was with a black box, the higher one with a splice and jet kit, pipes. the wire splice released more poneys she went from 46hp to 50hp just with the splice before the rest was fitted!!!!!! , also youll see that pre wire splice and work 10500 was about it for peak power anyway! what work has been done to your bike? maybe your at peak?