CALIBRATION UPDATE - HPTUNERS hd-cummins OS swaps or flex fuel

OS swaps or flex fuel mods just leave them in the mods list and we should be able to make it happen

And program our new custom tune files into your machine

Completely open to modification

Exact power gains will vary between machines but we will always be able to get the most performance possible out of your current setup

CALIBRATION UPDATE - HPTUNERS hd-cummins OS swaps or flex fuelIf you need a tune update then this is what you will need. When you install larger injectors, turbo or pumps then the truck will need to be recalibrated to get the most out of it. Note all the changes you have made and what tune updates you require in the truck mod list. If you need to revert back to stock tune just make a note in the mods list that you just want a copy of your stock file.