Adaptive flapper valve replacement

[Nasty]

10 hours ago, Austin66 said:

What brand tune where you using?  I have 1 yr left on the GM powertrain and I'm close to saying screw it.  I bought my truck and have an extended warranty for 4 more yrs through Carmax so who knows how that will go.  I doubt they'll be as stringent so it'll be time to rock n roll.

Local tuner. I don't really believe much in other types of tunes

[Penguin VII]

I believe each dealer will react differently to seeing any flashes (if it's true they can see them). I'm not sure the exact process with getting GM to warranty something so perhaps it could be an issue. One thing to note though, you have to flash the system to change tire size right? Couldn't that be accounted for the flash?