Not sure which 2000 Ford Focus Air Filters are right for you? We have over 4 customer reviews, with an average rating of 4.5, to help you find exactly what you're looking for. Steven M from Hooksett, NH said, "I purchesed a K&N Air Filter for my car mainly due to the increase of gas prices. The filter was easy to install, and I already notice a bit of difference. If you keep your engine tuned and running clean, chances are that your vehicle will use less gas. I am pleased with my purchase."