Thanks for the advice! I might go ahead and replace the coil boots. One of the coils (can't seem to remember which) didn't pop down on the plug like the other did, and I have a feeling that's the problem. Only downside is I'm broke! Lol. But the good news is that I've got a pretty good idea now. I just wasn't sure if the Kia was finicky about the CRC products or not.
I also deleted the resonance bottle on the intake pipe. I wasn't sure if that would cause any issues either.
The car threw a bunch of codes last time I checked it at work, but I never got around to changing the plugs because of how involved it is. I believe it also needs a catalytic converter. I live in a state where they are not required, would the car run alright without it?