K&N Drop-In Air Filter, 2013-18 Focus ST/16-18 Focus RS

Want to keep your factory air box and improve the performance and gas mileage of your 2013-18 Focus ST or 2016-18 Focus RS ?

This K&N drop in filter is just what you need! You can gain a few horsepower with this, and have a reusable/washable air filter that will save you money over the cost of buying new factory air filters! Installation takes about 5 minutes with a 8mm socket.

Please note: The photo above of the filter in the airbox is how it looks with the airbox lid off. We recommend you re-install the airbox lid after installing the K&N air filter.