Enhance your Challenger, Charger, or Durango! Z Automotive Tazer features can be broken into three categories. Vehicle Settings - accessed with the engine OFF and the ignition in the “RUN” position. These are changes made to the vehicle such as tire size, gear ratios or settings which accommodate other upgrades. These changes will continue to operate after the Tazer is unplugged. Every single time you make changes in the vehicle settings, you must perform a full reboot and two sleep cycles (see user guide). Live Settings – accessed with the engine ON. These are selectable options that the Tazer performs live, only while it is physically connected. “Non-Menu” Live Functions – these are not located in a menu. They are activated automatically or with a steering wheel button combination. These are operations the Tazer performs live, only while it is physically connected. For a full list of available features and how to activate them see user guide. | Vehicle Compatibility – Fits 2011-2022 Charger & Chrysler 300, 2014-2022 Durango and Grand Cherokee and 2015-2022 Challenger. | Special Notes – As of firmware 2.5.9, the Steering Wheel Shifting feature has been deprecated due to incompatibilities with newer features. As of this firmware, the Peak RPM display feature has been deprecated due to incompatibilities with newer features. This only affects 2011-2014 vehicles.