Range Technology RA003B Blue AFM/DFM Disabler is a plug-and-play OBD2 module for 2007–2022 GM V6 & V8 cars, trucks and SUVs. It disables GM Active Fuel Management(AFM) and Dynamic Fuel Management(DFM), letting your engine run full cylinders at all times. No ECU reprogramming, reversible design, simply unplug to restore factory settings. It also turns off auto start-stop.