Well for one, I'm not the one that ran it. He did, and he was dubbed the fastest (almost) stock mustang in the area. He was a GREAT driver and he got damn lucky, we went to the Ozark International Speedway track all the time trying to beat his records. He also tore the car down to basically nothing when he raced.
And also, I'm pretty sure the 2004 GT Stock's run time is around low 14's to 14 flat. So a 13.9 is very very relistic.
Now add on gears, bolt ons, the h pipe, cold air intake, and becoming a better driver in general over the year and a half we peiced it while I was with him, yes a 12.5 is pretty outstanding, but thats just what we were
oh and I'll work on the time slips, but concidering I live thousands of miles from him now and we hate each other...lol I wouldnt count on it. but I'll try