To the OP, I am not sure what air intake mapping is, so I can't comment on its warranty implications. But my statements below apply to pretty much every manufacturer, including Kia.
Just a little clarification (at least for the US). A manufacturer doesn't void your warranty, full or otherwise (just the powertrain). But they will DENY a warranty claim. They can do this for a number of reasons (using the vehicle as a taxi, using the incorrect oil, etc.) and for our purposes here, performance modifications. They will claim the root cause of the issue is not a manufacturer defect but your alteration. The vehicle operated outside of its factory parameters (boost, fuel rail pressure, on and on) and this increased "stress" caused the failure. You then have two options. You pay out of pocket or you take them to court. If go the court route you will attempt to prove that the company who engineered and manufactured the vehicle is incorrect and that your alteration was not the root cause of the issue. Good luck.
The above is "usually" logical in that they don't refuse to replace your navigation head unit if you have a cold air intake. Your modification has to "make sense" as a possible root cause.
Lastly, if something new were to break, you are free to file another warranty claim, even though one of your claims was denied. They may deny again for the same reason. It is also possible that one might make it through.