well went to the track today with a good friend of mine and on a stock LBZ went 12.42 consitently had a traction issue all 4 tires break loose but all in all great day mods are traction bars lift pump trans and a torque conveter lockup box from bt diesel works and duramax tuner efi live will be going back with some different tires soon all runs made a GLD in Union Grove WI