Quote:
Originally Posted by Evil-Bee-NH
Everything is there is no hidden tune despite what some tuners will claim. The 2017 just basically let's GM know you tuned the car lol.
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GM will know if it's tuned as soon as it's plugged in at the dealer, whether or not they actually care at the time your car is in for service depends on why you're in there. If you have an engine failure, they WILL look at the tune, and they WILL see it.