While the best I got out of my 12 GT stock was a 13:09 @109, 60' 2.05, I will say the car is much quicker than that. I had issues the night I ran being locked out of 3rd and 4th at anything over a 5800-6000 rpm shift (which essentially killed the runs), which is about a 1000 rpms low and the car still ran 13:09. My guess is if there hadn't been shifting issues the car would have run 12:70s that night.
2012 Ford Mustang 5.0. Brembo, 3:73s
2012 SRT Challenger 392 auto 12:40s 112 stock
2010 SS, LS3, Cammed, LTs, 12:20s
2004 Redfire Cobra, Pullied & Tuned
1986 GT, Ed Curtis 347ci, 11:20s motor. 10:30s 100-hp shot