I have a Saleen Supercharger (smaller pulley) with Cold Air, Comp Cams, Ford Racing Throttle Body and a few other goodies. Have not had it on a dyno in a while but I know after I add headers in a couple weeks I'm pretty much at safe limit. If I recall the max torque on these stock internals is somewhere around 480. After that you're playing roulette. Not to sound like a commercial here but that's why I worked with the Brenspeed guys. They install, test, tune and race all of the stuff they sell. They are licensed for Roush, Saleen and Edelbrock superchargers. I think a couple more too. They know the limits of these engines really well. They're also doing a lot of work on the Coyote motors.