Range AFM Disabler Active Fuel Management Disabler

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The Range AFM/DFM Disabler allows your V6 or V8 GM vehicle to run in full cylinder mode at all times, preventing the Active and Dynamic Fuel Management systems from dropping cylinders. Range Technology's  patented technology is the only product that will disable Active or Dynamic Fuel Management without reprogramming the factory ECU. Full power delivery all the time without factory warranty concerns. CARB testing process in progress!


  • No more shuddering as your engine cycles between running on half or all cylinders
  • Improved power at light throttle with all cylinders firing which can actually result in improved fuel economy depending on your driving habits
  • GM's troublesome valve lifters will no longer be tasked with activating and deactivating constantly, saving you money on costly future repairs

Q: How long do I leave it in for?

A: It has to stay plugged in. 

Q: Is this updated to the latest firmware?

A: Yes, all units shipped from Midwest Aftermarket are updated. 

Q: Is the light really bright at night?

A: No, you can hardly see it and when you turn the vehicle off the light turns off aswell.

Q: What does this device do?

A: This device disables the active fuel management system in the V8 GM vehicles and keeps the engine from shifting back and forth from V4 to V8.

Q: What if I don't like the product?

A: Midwest Aftermarket will take the return back within the first 30 days and even pay return shipping!


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