I was about to say oil or air filter?
I changed my oil and put in a k&n oil filter last time based on several reviews and tests I read.
The K&N drop in is about 3/4 of an inch thinner than the stock kia filter, and it sounds ALOT better
not sure what the actual performance gains are but the sound and the fact that it never has to be changed if you clean it every year is more than enough for me
i agree it sound better more so when i took out the prefilter on the air box, car sound more throaty when i step on it. as for the difference in hp not noticable, untill i shut off the tcs and really put my foot down. at least it feels better on the seat of my pants!
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