Fuel pressure regulation maybe?
You'd have to monitor that along with injectors, and the ECU programming for pulsewidth and everything else also then. Probably more complicated then coming up with some sort of intake or exhaust restriction. Also, they like something they can hand out at the beginning of the weekend and take back at the end. So I would rule out an exhaust restrictor also, I'm guessing if they do anything it will be an intake restrictor, I'm just not sure what the intake looks like to speculate how they will implement it. I suppose they could restrict RPM too though since I believe their V8 limiter is at 8500, at least I think that's what the street car will spin. They may have it turned up from there even I suppose.:shrug: