There is a stinger owner who had is sunroof rattle claim denied because he was on lowering springs, even though Kia is fully aware that the rattle was a big issue on 2018 cars. My point is Kia is garbage at honoring warranties, it can also depend on dealerships.
I could write a book on it
Bottom line is, if you mod your car you take a risk...and guys, in 2000 I went to through this with an attorney for 8 months against Ford and won, I'm fully aware of the mag-moss act and our rights, this is not a debate about that
. Kia knows most won't spend the money to fight their decisions, if they choose to not honor your warranty it's up to you to decide what your willing to do. This is the short answer, lol
As far as this mod, it's safe but you can email Joe from his website if you want specific information as to how it is interacting with the system.
I'll check the link, find out what's up.