Worked just like it should have, I got all parts before I was supposed to which really helped. I will be using auto anything for things I expect to purchase in the future. Tuner works as advertised, got about 6mpg more after installing the GT platinum. Which is weird because the truck is so much more responsive and has way more power. Truck was always hard to start since installing the unit it starts first time every time. Not sure how it fixed problem but I like it!
I have a 2016 Silverado crew cab z-71. It's no secret these trucks are underpowered. This tuner dramatically improves off the line performance and my fuel economy improved by 3mpg in town and 4 on the highway. The improvements in the transmission shift patterns are very noticeable and I'm looking forward to see what this does for towing capability.
Not much HP increase, unsure...
Unit does a great job of monitoring the engine and various other statuses but could use a ton of improvements in engine optimization. I really think they were overly cautious when programming for Nissan. Granted, I have a 4 cylinder so wasn't expecting massive gains but am very disappointed because I know this thing could do so much more.