GDP switch-on-the-fly tune files for the 2016–2019 Titan XD 5.0L Cummins, loaded through HP Tuners. SOTF lets you change tunes without reflashing, so you can run one setting for towing and another for daily driving. This pack also includes GDP's tuning support. Tune files only, so the HP Tuners MPVI3 is sold separately. For off-road and competition use only.
