The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active or Dynamic Fuel Management system from dropping cylinders.;Range AFM/DFM Disabler keeps you in full power 100% of the time.; Simply plug into your onboard OBD-II port and it instantly begins working to eliminate the AFM/DFM system.; The power and control you need in any situation.; The Range AFM/DFM Disabler does not reprogram your factory ECU.; Leaves no trace. Unplug it to return to factory settings; Fits all V6 and V8 General Motors (GM) active or dynamic fuel management vehicles, includes cars, trucks, and SUVs.;