I have a diablosport predator 93 tune in my truck right now. It made a noticable difference, mainly because of TM getting turned off. I had problems with the truck running lean before the tune, because of a granatelli mass air sensor. This was confimed by one of their reps over the phone. I'm able to add fuel with the handheld but, only above 2K. It's supposed to hold 5 custom tunes, so would a nelson tune be able to add the right amount of fuel and spark to get it running like a beast, or would I be wasting some money? If Allen or Melissa could respond to this that'd be awesome.