I have a 01 gmc 3500. Its stock besides stage 5 ppe trans. I have built several dodges, an fords. But never messed with duramaxs except lmm. It has newstock injectors an cp3 as well. I want to make as much powersafely as possible for between 6 an 10 grand. School me. Thanks guys

 

Well if you already have the trans the you are in pretty good shape! First thing is a lift pump, then I would do EFI live... You can make well over 500 rwhp with that tuning alone