I have to agree with Doug as the tow tune guru. Innovative makes a really strong tow tune that uses the turbo like an exhaust brake. I think Innovative is the only one that I know of that has the PI back on. It didn't work very well on my truck, (03) but I guess some others have had luck. All out race and HP, they are all real close. I think DJ might pull ahead. I ran his race tune last year and it was 1/10th of a second faster than the others, but that was a year ago, and I didn't have a tune by Doug yet.