I'd be interested to know what the updates do as well. I would hope possibly performance improvements.

I updated mine this past Monday. I'm not having lockup issues. But there are some weird things going on. When I first turn it on, the tune button is grayed out. I have to select another option, go back and then I can select tune. Also at one point during selecting options I couldn't get back to the ...

Ah thank you. It's been a while. Forgot you need to tap standard tune again to get the TCM options.

I updated the software on my i3 after not using it since last November. I went to update my TCM tune and I'm not seeing the firm or hard options. I now see sliders to adjust the firmness per gear for normal or tow/haul. I remember just having the option to select firm or hard. Has that moved to a ...

Interesting issue I'm having. I set the AFM to off and applied the tune. When I go back to modify parameters it says it's set to on. I drove around and didn't see it switch the V4 so I'm assuming it's off. Maybe just a glitch.

I'd like to know if anyone else has adjusted any of the other settings for the 5.3 like shift firmess percentages, WOT, torque management percentages, etc.

I finally got the i3. One question before I start tuning. When does the backup occur? I haven't tried tuning anything yet. Does it automatically backup before installing a tune?

Also what's the difference between the 87 octane and Diablo tune? The octane rating?

2015 Silverado 5.3 here. Only mod is an air intake. Possibly getting an exhaust. I'll be purchasing the i3 soon. Is the only difference between the Platinum and regular the California restriction? Or can the Platinum perform more tuning options like telling it I have the air intake?