K&N’s replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration.
These filters are washable and reusable and are custom designed to fit into your existing factory air box. Their drop-in design means adding performance is simple.
Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty™
And for only £55.95
K&N Replacement Filter for Focus Mk3