If you look at a stock tune, or even a box tuners tune(wich you can read from your truck), you will see how poorly they are tuned. looking at a box tune can give you an idea of what it takes to get horse power, but I don't recomend useing there tables, Its easyer to build a new one from scatch that will be smother and run cooler. I've only seen one free modifyed tune on a differnt forum, but all the files are gone there now, not sure why. I do have that file and some other box tuner files I could send you to help give you an idea of what to modify. But again don't copy the tables, make your own(Thats the point of doing custom tuneing and the way I have always done it)