I was in my Silverado SS. I was grudging against my buddy 12 F150 with a 5.0. Started out with a 15.1 and ended with a 14.86. His quickest was a 15.2. My truck is all stock outside of a drop in K&N and a muffler. His is stock. uploadfromtaptalk1413757721014.jpguploadfromtaptalk1413757728940.jpg