The E41 controller modification service will allow you to use the aftermarket tuning suite of your choice (Does not work with HPTuners) to modify your E41 equipped 2017+ L5P Duramax.
This is a service performed on your original ECM with a 1-2 business day turnaround.
You will receive your original ECM back!
You will not have to perform an immobilizer relearn or any other relearn operations before you reinstall the ECM in your vehicle.
The ECM operating system and calibrations are not modified in any way from OEM stock, and retain the original OEM CVN's.