- Easy, Stock Replacement
- Washable & Reusable for Life
- Improved Airflow and Filtration
- Save Money and Hassle
Drop-in Replacement K&N Filter that is Completely Reusable
One of the best ways to get a nice performance boost out of your Focus ST and save some big bucks in the long run is by grabbing this drop-in replacement air filter from the air filter masters over at K&N. This drop-in replacement air filter is reusable for life and has both improved airflow and filtration over your hot hatch's stock disposable filter. The K&N filter is a nice upgrade that saves you money and hassles in the long run. All you need to do is clean it and re-oil it when it gets dirty and you're all set to go.