Well, I've decided to take the KIA back to have the muffler replaced. The damn thing sounds like a fart-can, which puts me into a group of drivers I don't wish to be associated with. >_<
You'd think I was breaking the sound barrier with all the noise. And that's what really pisses me off about the thing.
I told the guy a made a bad call and wanted just a standard muffler on there.