Late reply I know, but I have a 2017 5.3 V8 Silverado 1500 that I bought new, and I put a range chip in as soon as I could, and it works great. Keeps in in V8 mode all of the time, plugs into the port for diagnostics. (odb2) I want to say it was like $300 though. Only time (or actually mileage) will tell if it was worth it.
www.rangetechnology.com
I have been trying to keep it low on miles, I think it has around 30,000. I was leary about getting that engine with the afm but back then chevry ran a 35% off retail price rebate and I took the chance. So far it has been good.
Cons to the range chip: it will interfere with a vehicle emissions inspection check, you have to run it a bit without the chip if you reset your trouble codes. Also I take mine out after turning off the vehicle, and put it in after the normal startup diagnostics, it's easy to forget.
Lastly, I have to say, I also bought a 2017 toyota rav4 used recently. The toyota I can put in 3 different modes, economy, regular, and sport, and I use sport a lot around the town because it drives and handles better. Just push the dash button and I'm good to go at startup. With the 2017 GM, and I find this really aggravating, there is no option to do this with the V4 vs V8 option, you cannot turn it off without cheating the system somehow. In addition, the transmission seems to do all kinds of wacky things just to save 1mpg of fuel. Toyota gives you the option of how you want to drive, GM forces it down your throat and this just bugs the $#@! out of me. Ok ranting off thanks