About this item No installation required, simply plug into your onboard OBD-II port and it instantly begins working to eliminate the AFM/DFM system. OBDAFM AFM/ DFM Disabler allows your V6/ V8 GM motors to run in full cylinder mode at all times, preventing the Active or Dynamic Fuel Management system from dropping cylinders. Compatible with V6 / V8 General Motors active or dynamic fuel management vehicles, includes cars, trucks, and SUVs. Will not reprogram your factory ECU, unplug it to return to factory settings. Please confirm the compatibility before ordering it.