Range Technology RA003R AFM/DFM Disabler-Red
Product ID: 309397367
⚡100% full power, no cylinder drop
🔌Plug & play OBD-II setup
🔴Red LED status indicator
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⚡ Unlock your truck’s true beast mode—no compromises, just power.
The Range Technology RA003R AFM/DFM Disabler is a plug-and-play device designed for select GM vehicles that disables the Active Fuel Management system, ensuring your engine runs on full cylinders at all times. It installs easily via the OBD-II port, requires no ECU reprogramming, and features a red LED indicator to confirm operation. This device delivers smoother shifts, improved throttle response, and consistent power without voiding factory warranties.
| Manufacturer | Range Technology |
| Brand | Range Technology |
| Product Dimensions | 10.16 x 10.16 x 2.54 cm; 9.07 g |
| Item model number | SB-122AMG |
| Manufacturer Part Number | RA003R |
| Item Weight | 9.07 g |
D**Y
Love this, plug and play. New truck!
My truck is a 2017 gmc sierra 1500 with a 6.2motor, 8 speed trans. It has been a night and difference for the better. Better fuel mileage, smoother shifts, more power at any given moment. My truck is a beast let out of its cage, or the perfect work horse pulling away. I have had this in my truck for three months. No shaking or hesitant shifts, just a very happy truck. Worth every penny. Just buy and thank me later.
M**K
easy install well worth it
easy install,instantly sounded different, better performance all across the board,truck shifts better, gas mileage on day to day driving was a tad bit better,on a highway trip towing an atv trailer my gas mileage wasnt as good but a decent trade off for better power on the hills, will i keep it installed? most definatley!
C**.
10 month review and MA state inspections PASS
I have been extremely impressed with this Range AFM disabler since I first used it in May 2025. Besides the obvious fact that you will use more gas staying in V8 mode. It offsets the mild shudder without it and the brief hesitation when cruising at 75 and open it up. I didn’t notice any battery drain while I left it plugged in. (Always start vehicle with Range plugged into OBD and turned off while still plugged in) Lastly, here in MA we have to have yearly inspections and I unplugged Range minutes before the machine was connected to my OBD. Range has no affect on your MA state inspections. No red flags, no issues at all Absolutely love the Range AFM disabler
T**Z
Its cool
He gets the job done, although sometimes it randomly does not work. I noticed it because my auto stop will engage.
A**R
Different truck
This has changed driving feel of this truck. Im using on a 2021 GMC Acadia. As good as sport mode and no auto stop. Very happy with this product. Don't be cheap. Buy the good one. Remember, it's your cars software you are changing. Also eliminates vibration when lugging in V4 mode at low speed
Trustpilot
3 days ago
1 week ago