One of the Fiesta agent Michael Berenis got into the 16s with his stock ST.
[video=youtube;ZzizioKZzIs]http://www.youtube.com/watch?v=ZzizioKZzIs&feature=c4-overview&list=UUkQ2uHKqsval-ekG3-yjqWQ[/video]
I might take mine to the tracks this winter, I'm hoping to get in the low 15's.