This device works great, I plugged it in and it immediately turned AFM off and it’s keeping it off. My engine runs so much better now, very happy with the product and quality.

Product works great, it got rid of the hesitations and my engine runs a lot smoother now. I just started using it but haven't seen any noticeable MPG changes so far. Definitely worth it!

Working perfectly. Does exactly what it is supposed to do. Eliminates V4 cutouts. Best of all, US made.

This product does what it says. Excellent throttle response from my 6.2 vortec. No more back and forth from v8-v4 .Hopefully will save my engine in the long run from lifter failure. Easy installation and delivered 2 days early! Most of all….DESIGNED AND MANUFACTURED IN THE USA!!!!!

Very good product that works on my 2015 Denali without draining my battery. Cheaper than the range and does the same job.

The device works great and like it should. It’s keeping my truck in V8 mode all the time. I can notice a difference in my truck. feels a lot better. This product has given me the piece of my mind that my lifters are protected. The quality of protect is noticeable and glad I spent a little more for it. Plus made in America. USA USA

If you wanna get stranded, buy Chinese modules. Had extremely bad experience with "Chinese" electronic modules; always hunt for Made in "Anywhere but China". Unlike other modules on the market, bought it for its "Made in the USA", the ease of use and low to no battery drain. Happy with the Boost module. Plugged it in and it works. I believe it's a new company. All reviews were very positive so I pulled the trigger. All reviews were also very young so only time will tell. Will be updating if it fails, but so far so good. Hope it lowers the probability of failed lifter/timing event.

Trying to disable my afm but doesn't work. For sports cars stick with the range device. This thing feels cheap and didn't do anything.

Boost AFM/DFM Disabler Review First off, at least according to the dash readout, this Boost Unit is doing what it is advertised to do and disabling V4 mode. However below are a couple observations and the results of some rudimentary road tests I did that others might find helpful. Some background: I installed this on a 2014 GMC Yukon XL with 177K miles on it. Whenever I repair a vehicle or want to test the performance, I have a 25 mile loop that I run that is approximately 5 miles city driving (1/2 @ 25mph, 1/2 @ 40mph), 10 miles on a 60mph state highway that includes going over a hill that rises to about 400ft above the low point of the road, and 10 miles on a 55mph country road with multiple curves you need to slow down for. This allows for testing of acceleration, up hill, down hill, cornering, etc. I ran this loop multiple times to test with and without the boost device. I cleared the trip computer average fuel economy between each run. See results below. 1. First of all, you do not need a device like this in order to accomplish keeping the vehicle in V8 mode. You just need to run in "M" instead of "D" and put your "M" setting to one less than the highest gear you have. For example in my 2014 GMC Yukon XL, the highest gear I have is "M6", so to stop the vehicle from going into V4 mode, I just have to choose "M" instead of "D" and then use the "+" button to set it to "M5". If your vehicle goes up to "M10", then you need to use "M9" to disable the V4 mode. I have tested this on multiple runs, and even in traffic it never goes into V4 mode. 2. After I plug the Boost unit into the OBD2 port, I noticed that the RPMs stay higher on average than when I do not have it plugged in. It seems to be somewhere between the default factory RPM settings and the RPMs when you are in Towing Mode. However, this seems to make the vehicle more responsive when you push the gas pedal. 3. In my case, the Yukon gets better fuel mileage consistently in "M6" and is more responsive to the gas pedal than when just in "D" (drive). For my vehicle, when it is in "D" it tends to bounce between gears more frequently when cruising at highway speeds, whereas in "M6" it more consistently stays in the top gear when cruising at highway speeds. There must be some difference with how the computer handles "D" and "M6". 4. Driving my test loop (see above) without the boost unit and the vehicle in "D" (vehicle went in and out of V4 mode multiple times), the readout on the dash showed the trip averaged 20.3 MPG. 5. Same run without the boost unit and the vehicle in "M6" (vehicle went in and out of V4 mode multiple times), the readout on the dash showed the trip averaged 21.3 MPG. 6. Same run without the boost unit and the vehicle in "M5" (vehicle never went into V4 mode), the readout on the dash showed the trip averaged 20.9 MPG. 7. Same run with the boost unit and the vehicle in "D" (vehicle never went into V4 mode), the readout on the dash showed the trip averaged 18.9 MPG. I noticed that even with the Boost installed, the vehicle was still a bit laggy when starting off from a dead stop. 8. Same run with the boost unit and the vehicle in "M6" (vehicle never went into V4 mode), the readout on the dash showed the trip averaged 19.6 MPG. Perceptually this had the best throttle response of any of the combinations. So in my case the best fuel economy with V4 disabled was achieved without the Boost Unit, and the vehicle in "M5". This also perceptually gave the 2nd best throttle response. However, this Boost Unit definitely at least perceptually improved the performance of the vehicle, most noticeably when I had it in "M6". This was not a controlled experiment and the traffic varied between each run, but I did not spend significant time just idling on any of these runs. Your results will likely vary from what I got, but I thought this would be useful information for those looking at purchasing this unit.

I wans't sure if my 2019 GMC Sierra 1500 has an 8-speed or 10-speekd transmission, so I emailed Boost with my VIN number to make sure their AFM/DFM Disabler would work correctly on my truck. Within 20 minutes, I received a return email answering my questions! Even better, shortly after the first email, I received a follow-up email from the same Boost Rep, indicating he had looked up my VIN and confirmed my truck has an 8-speed trans and the Boost unit should work perfectly. WOW! Actual "Customer Service". I highly recommend their product.