ProCharger's taken the twin-cam 3.7-liter V6, bolted on a supercharger, and dialed up eight pounds of boost. The $5K upgrade boosts power to 427-hp at the wheels, or somewhere in the 475-485 hp range at the crank.
I really do love the new Mustangs though. They are sexy as all get out, but I'd have to have one that turned left and right, and it would HAVE to be Grabber Blue.