The Terminator X Max ECU allows the ability to use 2007+ GM 6L80 and 6L90E transmissions by communicating via CAN with the internal TCM (Transmission Control Module). The supplied OBDII transmission tuning handheld is used to adjust shift points, tire size and gear ratios. The Terminator X V3 software provides the ability to dial in Torque Management to optimize the desired shifting characteristics when using a 6L80/90E Transmission. Terminator X V3 software also allows a user to control the Secondary Shift Mode within the Transmission TCM and allows use of Tap Up/Down Shifting. The Terminator X V3 PC Software, you can have virtual torque management tables, virtual TPS tables for dialing in shift characteristics, and drive by wire (DBW) and timing torque reduction tables for smoother shifts. Within the handheld, you'll find support for Tap Up/Tap Down, secondary shift mode, read and clear TCM fault codes, and raise and lower MPH or RPM shift points. If you currently have a Terminator X ECU, upgrading to a Terminator X Max ECU can be easily done by plugging your main harness into the Max ECU and re-uploading your existing calibration.