Do you know how much past 10,000 they will run?
Are you in Pro-stck class or improved stock? The programable systems are illegal (ISR ruling) for improved but are OK for Pro. They work well once you figure them out. If you are racing improved, you need to find a RPC box with a changeable chip (1st choice) Yamaha Pony Pak (2nd choice) or a Red FSM box (3rd and last choice). As I said earlier, my guess is your hitting the rev limiter and falling off the curveThanks Skinner. I've been messing with this for some time now. When I exceed 10,000 there is a noticeable change in the sound and performance. It sounds to me like the timing drops right off, like it hits a rev limiter. I have clutched it now to peak in 660' at 10,000rpm. Not necessarily the best plan, but I don't currently have a high RPM box to try.