Enter the last 5 digits of your tuner's serial number. The serial number can be found on the SHOW SETTINGS screen on the main menu of your tuner.
HIGH SULFUR tuning enables the ability to generate a tune with programming that supports modified emissions systems on applicable vehicles with DPF/DEF systems (2007.5+ Dodge 6.7L Cummins, 2008+ Ford 6.4/6.7L Powerstroke, and 2007.5+ GM Duramax LMM/LML).
H&S released two versions of their Mini Maxx and XRT Pro series tuners - STREET and RACE.
STREET and RACE tuners are almost exactly identical in every way - except for HIGH SULFUR tuning.
The unlock code is generated using the last 5 digits of your Mini Maxx or XRT Pro's tuner serial number. This information is located on the SHOW SETTINGS screen on your tuner.
NOTE: Once you receive the unlock code, make sure that you keep a record of it somewhere - if you change vehicles then that option will be reset and disabled, but the unlock code NEVER CHANGES because it's tied to the tuner's serial number - NOT the truck.