Description: These custom tune files are designed for 2017 - 2023 GMC vehicles with the 6.6L Duramax L5P engine, paired with MPVI2 or MPVI3, an unlocked PCM, and an unlocked TCM. They unlock your L5P's true power potential, ranging from stock delete to 150HP race tunes. We can customize the files according to your truck's modifications. Optional add - ons include ECM credits, TCM credits, and TCM tune files. All tuning provides full access to calibrate, log, and scan via the OBD2 port with your MPVI2 or MPVI3 and VCM Suite 4.3+. Power levels vary from 0HP to 150HP when emissions are off. TCM tuning is optional but recommended, and it improves line pressure. SOTF tuning offers the cruise control method or a manual toggle switch option. You'll need to unlock the ECM using one of the specified products (not included in the price). Installation is quick and easy with step - by - step instructions.

How to use: First, read the stock file of your truck using the HPTuners MPVI2 or MPVI3 device. Then, send this stock file to us, and we'll send you the custom tuning that suits your truck. You can use the tuning to calibrate, log, and scan your vehicle via the OBD2 port with your MPVI2 or MPVI3 and VCM Suite 4.3+. For SOTF tuning, you can choose the cruise control method accessible from your steering wheel or a manual toggle switch if you add it. Note: These are just the tune files. If you need hardware and credits, choose the appropriate custom tune package. You'll need to buy an ECM unlock product separately as it's not included in the price. Maintenance: There's no special maintenance required for the tune files. But make sure your MPVI2 or MPVI3 device is in good condition and keep your VCM Suite updated to version 4.3+ for smooth operation.