AFM/DFM: In Full-Time V8 Mode, Carbyte disables the AFM/DFM system and keeps the engine firing on all cylinders, all the time. Start/Stop: Eliminate the annoying Start/Stop feature, keeping your engine running 100% of the time. Diagnostic Scan Tool: Paired with an iPhone, iPad, or Android phone, Carbyte can transform into a full-featured diagnostic scan tool. Plug-and-Play: Stand-alone functionality allows Carbyte to work by simply plugging in the device. No app is needed for AFM/DFM and Start/Stop functionality! Optional Smartphone App Included: Control the AFM/DFM and Auto Start/Stop functions from your phone for the ability to revert to factory conditions on the fly. Easy Installation: Plug Carbyte directly into your OBDII port! No risk of damaging critical components from installing device into your engine compartment. Vehicle Compatibility: Carbyte works with a wide variety of GM vehicles, including the latest 2021+ GM SUVs and 2022+ GM trucks. SEMA Certified EPA Emissions COC