GM’s Active Fuel Management System (AFM) is designed to help V6- and V8-powered vehicles meet fuel economy standards. However, it has an annoying habit of kicking in when you need every cylinder firing.

The Range AFM Disabler Device will prevent the AFM system from dropping cylinders so your vehicle stays in full six- or eight-cylinder mode all the time. Just plug the Range device into the onboard OBD-II port. Range uses messages sent over the factory CAN-Bus system to ‘tell’ the ECU to stay in full power mode. That means the AFM is disabled at the source and your vehicle will run as it normally would in full power mode, and downshift lag problems are eliminated.

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