when you ordered the Gt parts did the dealer tell you that it could void your warranty? i just got my first oil change on my GT but i want to install a BOV but dont wanna worry about warranty issues.
He used a factory Kia part that was NOT originally part of his car. Technically, if the lower bumper cover breaks or cracks due to a manufactured defect the only warranty would be as a factory ordered part - usually one year from date of purchase.
If you install an aftermarket BOV you won't void your car's warranty - HOWEVER, if you have a problem that is BOV related (leaking BOV seal, DTC for incorrect boost pressure, or DTC for a faulty RCV solenoid for example) then Kia will not honor the warranty repair.
If you install an aftermarket exhaust it will not void your warranty, HOWEVER, if you have a problem with your exhaust (DTC for incorrect backpressure, for example) then Kia will not honor warranty repairs specifically for exhaust related problems.
Any system on your car that you alter - it would not be Kia's fault if you have a problem with that system.