The guys at ProCharger here locally have been playing with blown Cobras on the dyno, tuning on the fly to max out power while keeping just away from detonation. The numbers your curve shows for stage 3 are real, and on pump gas. A local sideline shop called House of Boost is making a name taking things others cannot make run and cranking out big numbers, too. The guys at Boost are using some aftermarket ECU's, like FAST, which give them an easy window into the dynamic tuning parameters. Crazy stuff to an old guy.