This is the licensing fee for HP Tuners nGauge. This is separate from your tune file purchases.
HP Tuners requires the purchase of Licensing Credits in order to tune with an HP Tuners nGauge. The cost for each credit is $50. Below is a breakdown of how many credits each vehicle year takes. The cost of credits is already totaled when you select your vehicle year.
2011-2017 Mustang takes 2 Licensing Credits to tune with HP Tuners nGauge
2018+ Mustang takes 4 Licensing Credits to tune with HP Tuners nGauge