The customer will need to register online (https://afepower.com/scorcherpro/register) and enter their vehicle information to receive his custom tunes. The customer will also have the ability to adjust vehicle parameters such as tire size, axle ratio, and TPMS. The device also stores your vehicle*s factory tune for easy restoration back to the factory settings. Connects to the vehicle*s OBDII port and has Wi-Fi capability so you can download aFe POWER*s custom tunes whenever or wherever you want. Custom tunes can also be downloaded through a PC if desired. Monitor and display critical vehicle data using on-screen, full color customizable gauges. View, capture or download your vehicle*s data on one device. The SCORCHER PRO Performance Programmer offers the capability to read and clear DTC*s (diagnostic trouble codes). SCORCHER PRO Bypass Cable is required (P/N: 77-90009 Sold Separately) SCORCHER PRO Performance Programmer RAM Diesel Trucks 19-21 L6-6.7L (td) RAM Diesel Trucks 19-21 L6-6.7L (td)