My 2015 Corvette used to shudder and miss between 30 and 70 MPH. I took it to the dealer several times but they refused to replace any parts (torque converter, etc.) They only changed the transmission fluid. That help slightly, but still had the annoying shudder happening about every mile or so and it was really frustrating knowing that I loved this Corvette and paid so much for it but it drove like a clunker. This whole issue just started one day out-of-the-blue at around 8,000 miles. Well, I purchased this Range Technology AFM Disabler and my Corvette drove just like the day I bought it if not better!! NO shudders (AT ALL), since I plugged this in! HIGHLY RECOMMENDED FOR C7 CORVETTE OWNERS! I purchased an OBDII Short cord with a rocker switch so I can easily turn it off when I'm letting the car sit for over a few days, just in-case it drains the battery,

Would come out of v8 mode every once and great while not to often but when it did you just unplug it and plug it back in and it was good to go. improved gas mileage by about 1-2mpg I noticed hard to believe but it did I would recommend this to friends

I hated the way my 2017 Chevy Silverado drove without this product installed. I put aftermarket exhaust on my truck and every time it shifted down into the AFM 4 cylinder mode the truck bogged down terribly . Terrible drone from the exhaust system inside the cab. It ran like crap to put it bluntly. I put this product on the truck runs like it is supposed to no more of the 4 cylinder nonsense. If I wanted a 4 cylinder truck I would have bought a 4 cylinder truck. The mileage is very close to being exactly the same. It runs so poorly in that 4 cylinder mode that it feels like it is sputtering and running like crap. Not something that is conducive to getting better mileage. Note to GM get rid of that Active fuel management system it stinks. But range technology saved my truck from GM's hyge mistake. Well worth every dollar I spent on it.

This little magic box saved me from an expensive motor overhaul or replacement. The 8-cylinder to 4-cylinder drop on this Chevy engine, which was installed in pick-ups, Tahoes, and Escalades for the years 2007(?) thru now is known for great oil consumption. My 2008 Suburban LTZ (which I love) was blowing a huge cloud of white/blue smoke out the exhaust every 10 miles or so. I was actually filling up with oil and checking the gas. This device stopped the smoke bombs and now I'm hardly using any oil at all. My Suburban has 146K on it and if you look up the problem on the internet, you'll see many people with the same oil loss problem. I'd like all of the country that has this problem to buy this product. It really works!

Installed 2013 GMC Sierra 5.3 .. shuts off V4 .. no BS.. works as advertised, no real noticeable drop in MPG .. maybe half a MPG .. but works with out a problem .. no CEL . No malfunction .. works great !!

UPDATE: have had product for 6 months now .. zero problems ... I purchased this item for two reasons .. one to stop v4 and two to cut back on oil consumption .... It solves one .. no more 4 cyl.... Oil consumption remained the same. I'll save u the head ake... GM 5.3 still burns oil and is considered acceptable by GM to burn up to 2 quatrs in 3000
miles as per dealership .. so great job gm !! At least. I know the upper end is property lubercated !!