I would say thats way to much for our 4.6's your going to be spooling for days, but if you're looking for big power in the top end and revving the motor out past 7k I would say its perfect. The real question is what are your goals for the car? A roll racer, dyno queen, track car, or just fun street car? That will determine your turbo sizing.
2007 Mustang GT/CS - Bolt-Ons, 4.10s
2000 Mustang GT - Built Longblock & a big turbo (SOLD)