Not sure which 2005 Kia Optima Air Filters are right for you? We have over 116 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Ronald S from Escondido, CA said, "I've used K&N Air Filters before, they are a little pricey, but for the longevity, they are well worth the money. The biggest hassle is the time it takes to clean and dry them. I consider a swap service if the price was right."