Thanks for the answer nickahern1, what is mds?

 

multi dispacement system... its on 08's... maybe 07's, i forget, but it shuts down 4 cylenders when at highway speed to save gas

 

Auto's will benefit more only because shift firmness will change. You will still benefit from fuel trim and spark advancement.
Superchips or Diablo Predator are the two top choices. Tirepaq is only for tire correction I think. Both SC and Predator will do that as well as give you a custom tune. Well as custom as a canned tune can get..lol

 

disregard the poredator it is not available yer for us 4.7 guys...i would get the sc 3815 if i had a manual too just for the other benefits. its agreat tool to have.
check out classifieds on the various dodge ram forums youll find one for almsot half price from new.