Just because your Kia Sephia 1998 has a few miles on the engine, does not mean that you cannot get it to perform like it was brand new. Have your entire car inspected. Be sure to have your catalytic converter and oxygen sensor checked. When one of the pair fails the other is soon gone as well. So always make sure your entire exhaust system on your car is in perfect running order. At some point in time you may have to replace a worn out catalytic converter. If your car is running sluggishly or if your gas mileage has gone down the tubes, the cause could be a bad catalytic converter. Replace it as soon as you can with a new Eastern Catalytic Converter. That is a sure way to get back the punch, power and performance you have come to expect with your car. And your fuel economy will improve at the same time. Keep your car in tip top shape. Install a new Kia Catalytic Converter and you will be well on your way. Why wait? Get your car back running like new, today. You will be glad that you did. So will your engine. All our customers definitely deserve great technical assistance while purchasing high-quality auto parts for their car or truck. That's why we've established an always-open sales support desk to assist you with your calls. If you spot a better price somewhere else, let us know - we will meet or beat any advertised price for auto parts.