Drop in optimal engine filtration and performance with the Airaid SynthaFlow Air Filter. Replacing flimsy factory paper filters, this high-performance filter combines multiple oiled cotton gauze and synthetic fiber layers to deliver ultimate airflow and protection. Lifetime Warranty.
Not sure which 2013 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:
"Always put K&N in our vehicles. Improves performance, we get better mileage as well." —Scott D from Novi, MI bought a K&N Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.
"fit perfectly right in the stock airbox, the open end lined right up with the hole in airbox, minimal intake noise gains without an aftermarket air intake tube though, to my disappointment, good product though, would recommend if you'd like air intake noise on the ST without compromise in performance, get a filter like this along with the aftermarket intake tube and airbox." —David M from Champaign, IL bought a Green Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.
"Go Green! I'm not talking tree-bigger green though. This filter is awesome, took five minutes to install and I noticed a slight power gain immediately not to mention some turbo noise!" —Michael G from Usaf Academy, CO bought a Green Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.
"Biggest pros are the increased air intake over stock filter and the awesome sound on acceleration. The BPV is very audible. Haven't noticed any performance gains yet. Easy to install, took 10 minutes. Filter looked to be of high quality out of the box. Overall I'm happy I got it." —Michael B from Northville, MI bought a Green Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.
"The filter had a little dent in the leading edge, but shouldn't be an issue. You can hear the intake noise more and it sounds great. I do believe that my efficiency has improved as well when I drive carefully I have achieved 35-36 mpg on a few tanks of fuel calculating my MPG..." —Steve R from Bolton, MA bought a Green Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.
"The filter was a little tricky to install because the airbox lid fit is quite tight. After install the filter has performed well to date. Have noticed an improvement in pick-up from a dead stop and when merging into beltway traffic. Mileage seems to be the same. Overall I am satisfied with the filter." —James S from Middle River, MD bought a K&N Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.
"The sound is the best feature for the Focus ST.
Easy to install and will last similar to any K&N. It basically turns ur stock intake into a SRI without the cost." —Greg G from Cincinnati, OH bought a Green Air Filters for a 2013 Ford Focus, 2.0L 4-cyl. engine.