2011 Mustang 5.0 vs 2009 Mustang Shelby GT500

Mods:
GT500
Owner claimed 550RWHP prior to race (Noticed a very audible exhaust)
5.0
Intake, Bama 91 Race Tune, o/r x-pipe exhaust
4/4/2015 @ AAA Dragway in Fontana, CA
90 Degree Day @ 1,300 ft. elevation

[@sydliz1126]

Something is wrong here. I have a 2007 GT500 and a 2012 5.0. My 5.0 has full bolt ons and my basically stock (pulley and tune) GT500 will beat it pretty good.