Just got off the phone with GM and they confirmed any aftermarket part, even theirs, will void the warranty if anything happens. Just a fyi
so, it was mentioned earlier in this thread. but you need to read up on the magnuson-moss act.
say I install a leveling kit on my Burb. 2 weeks later the trans blows out. GM will be required to honor any/all warranties.
same situation, but this time a CV boot tears on the front axle (instead of trans failure). GM can reasonably deny coverage. Because the aftermarket component directly caused the failure.
That in essence is what the magnuson-moss act states. You can modify your vehicle. If a failure occurs, GM must prove that your modification caused the issue.
So in the case of this thread, a CAI can cause issues due to dirt, and over-oiling. Otherwise, it can't damage the vehicle. So again, if say an injector went out and washed a cylinder, GM could not deny warranty claims due to the CAI. It wouldn't hold in court and they know it. But if the MAF went bad (oily), or debris got into a cylinder...that would be a direct consequence of the CAI
All bets are off if you do custom tuning. You are pretty much guaranteed to lose if you do custom tuning and there is a motor/trans warranty claim. Too easy to tie correlations.