The EFI Live Autocal V3 is one of the most popular tuning devices on the market. It comes with OBDII & USB Cables and a single VIN Licence, with the option to purchase additional VIN Licences for additional vehicles.
This device allows you to receive remote custom tune files directly from a tuner via email, download them to the AutoCal, and then flash them onto your vehicle.
The device is needed to remove your entire emissions system. Your emissions codes will be gone. Your truck will last longer and get better fuel economy.