oh good. Please explain what this modification accomplishes. I would prefer some type of hard data, to qualify any statements.The best thing for your truck is to Modify your stock air intake box and you don't need to spend money go to our ppediesel.com and go product manual you can see the instuctions for the modification of air intake. In terms of program it depends on what application, if you are towing, racing or everyday driving.
so with just few more mods, you will be into the 30'si did a PPE tuner on my LBZ along with a exhaust and gained roughly 2mpg and then here about 2k miles ago i did the PPE CAI mod and gained another 1 to 2 mpg so it is worth it..the best programmer for the buck is the Diablo or Hypertech but the best is the PPE or EFI Live..
It was based on actual experience ...