I have a 2015 silverado with the 5.3 with AFM. My truck was shifting non-stop and my gas mileage was horrible. I was getting 13.5 in town 18.5 - 19 hey. It's easy to install. Just take it our of the box and plug it into the OBDI port under the dash. It can only go in one way. Start the engine and in a few seconds after the light on Diablo sprint quits flashing, your ready to go. No more V8 to V4 mode anymore. My gas mileage has increased to between 18/ 19
In town. Highway 22 might. It's worth the money!

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Will change my review if the product fails or causes damage

Easy to install, plug and drive! This is solely based on my experience with this device only and not opinions of others. I installed the device as soon as I got it the day of a very long drive. This drive has been all highway so far and I have not experienced any issues. Before getting this device my gas mileage on average was in the 14s and the engine was mis-firing. Since installing this device I have not felt any misfires and have received no engine codes. Very happy with my purchase for my 2013 Chevy Silverado 1500 5.3 L engine. I'll provide an update as time goes on.

Also I want to give Kudos to the vendor, Midwest Aftermarket, because I had originally ordered the product through another vendor and the item was severely delayed due to current events. Midwest Aftermarket couldn't guarantee next day delivery but they came through! Thank you Amazon and Midwest Aftermarket!!

So Far NO Problems Idling smoothed out No Loss of Power. I Bought this Truck 2017 its a 2013 Silverado 5.3 4x4 Ext. I had it a Month CK Eng. light came on missing Real Bad Took Back to Dealer The No. 1 spark plug Literally Blew up. Thought I Got Screwed on Truck,{ it was 1 owner Low miles that's why I Bought it } any way Dealer only Changed the one plug so I Figured it just Needed Tune up I changed the plugs { 4 plugs including No. 1 looked Bad ) it ran a little Better, still had Rough Idle. Changed Gas station No Changed . After 1 year same thing CK Eng Light No 1 Plug again came a part , Changed All Plugs , 2 plugs on both sides Looked Like they Filed Out, it Had Been using Oil.
Starting putting injector Cleaner in it . Gumout Multi system cleaner only one I use . Tried the Rest of products waste of money , 2 Tanks Back to Back Ran Better still a Little Rough Idle. I bought Petron Plus used Before in Older Truck worked well Stopped using Oil . Done a Lot of Research on these Engs. with Fuel Management Found out Iam Not the Only One with Issues. Found a couple of Products Ck'ed Reviews I purchased Diablo Sport Fuel Management Module plugged it in waited a Few Minutes No Problems Roughed Idle GONE Runs Like a scalded Dog Ill update a bout Fuel Mileage if I can Keep my Foot out of it . Runs and Sounds Like its Supposed to . If you want to Save your Motor Buy it. Don't Believe Me . CK out Fuel Management Problems on You tube. B.F. Ohio