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Another one of "these" threads.
You WILL get a CEL. It took mine about 1200 miles, but it eventually showed up. You don't HAVE to tune. It runs better and gets rid of the code, but your car won't explode without it.
If you don't want warranty problems, don't do anything at all. What do you think your dealer will say if you show up with LTs with an engine problem? If he wants, he'll refuse work right then and there on headers alone (with or without a tune). If he's cool with the headers, then the tune likely won't matter to him.
The warranty issue is not black and white. If you aren't comfortable with it, or can't afford to repair the car, don't do anything at all.
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2019 GMC Sierra 1500 AT4
Summit White
6" Lift, 37x13.50R24's
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