Originally Posted by 2012 Mustang GT
If he changed the pulley probably has a tune on the car as well
633 with just a tune. More boost and exhaust work will be even higher.
I don't see what the big deal with the GT500!!! It has 15lbs boost out of the box and with a pulley down and tune it will be 18+ lbs of boost. What current performance V8 wont throw down serious HP with that kind of boost. Pump the ZL1 boost from 9lbs to 15lbs and see what happens!!!