K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. We make over 1,200 different replacement air filters for the majority of vehicles on the road. 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. With most vehicles you simply remove the disposable air filter and replace it with a K&N. See applicable instruction sheet for details. Our stock replacement air filters for street vehicles are covered by our famous K&N Million-Mile Limited Warranty and will be the last air filter your vehicle will ever need.
Technical Bulletin


This Part Fits:

Year	Make	Model	Submodel
2011-2013	BMW	135i	Base
2013	BMW	135is	Base
2011-2014	BMW	335i	Base
2014	BMW	335i GT xDrive	Base
2011-2014	BMW	335i xDrive	Base
2013-2015	BMW	X1	xDrive35i