Alright, I got an extended cab 5.3L Sierra, It has 3 inch exhaust piping, no cats, Magnaflow Muffler, K&N CAI, and a Hypertech Tune.

I had some BFGoodrich All Terrain tires in the back, and the tailgate off.

I ran a constant 15.1, is that where I'm supposed to be? My friend tells my I should easily be in the high 14's. I do believe him and one of the reasons is, something is probably wrong with my tranny, once it shifts into second gear, it bogs down badly, the RPM's drop down to about 3-4k, not sure.