http://www.blueovalforums.com/forums/index.php?showtopic=13970&pid=188082&mode=threaded&start=30#entry188082
While not an automotive authority by any means... still cool none the less...
Not sure if this was posted here already (if it is appologize)
but Roush Performance has created 3 kits for the GT500
1) 45 HP from a CAI and Tune
2) 120Hp/88ftlbs for a Roushcharger replacement and tune
***this kit comes with factory 3year-36,000mile warranty
will not void...