Hey, it could happen. There's just no way to know what went down without hearing from the Goat's owner. (Wasn't me, I guarantee.) So much depends on the driver, the circumstances, the alignment of the planets, etc. I got smoked by 1.3 seconds by a "stock" LT1 Z28 on a 1/8th mile track, then later that night squeezed a .2 second ET win past a "built" Ram Air Trans AM. Anything can happen...
By the book, the '04 GTO should beat a stock '03 Mustang GT. But even if my '04 GTO somehow managed to out accelerate an '04 Mustang COBRA to 80mph, I would not run to a Mustang site to brag about my "awesome victory". There are just too many variables to consider.