Not sure which 2004 Kia Optima Air Filters are right for you? We have over 12273 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Here's what some of our customers have said:
"I have been loyal to K&N for over 25 years mostly on my motorcyles.Then I put one on my Dodge truck and mama whated one on her Kia,after seeing the differance in performance of the old truck.Long story short K&N filters are the only air fiter's we will ever use.End of story!!" —Frederick D from Jacksonville, FL bought a K&N Air Filters for a 2004 Kia Optima.