That should get the 500+ mark. It is going to be tough to hit 500 without taking the blower off one way or another. Just wondering, but why don't you want to do a blower swap?
+1. BTW The tune is essential. Don't just crank up the boost without the tune because the 03-04 Cobra's had leaning out problems and just cranking up the boost on that Eaton might be hard on your engine if not dangerous for it.
+1 thats what i was thinking but didn't want to be the one to say it to him. people overlook that way to often and i'm glad you said it.better to have a 300 hp car you can drive, than a 500 hp car you can't. Having 500 hp for the sake of having 500 hp is just compensating for something else.
Get your power to the ground before you start thinking you need more of it.