how's the tuning going to work with a procharger. heat will be an issue to look into I would think. And at what point to the engine internals need to be beefed up. I have been around alot of mustangs, even helped install some twin turbos, on 03's. one used 57mm blowers, and the other used 67mm's. The one with twin 57's made 850 hp on a dyno, and over 900ftlbs. But that was on a built motor.