Not sure which 2011 Ford Focus Air Filters - Custom Fit is right for you? We have over 14143 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 noticed a slight improvement in fuel mileage,and I little difference in power..................." —Michael F from Bushkill, PA bought a K&N Air Filters for a 2011 Ford Focus, 2.0L 4-cyl. engine.