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.
K&N's replacement air filters are designed to increase horsepower and acceleration while providing excellent filtration. Our stock replacement air filters for street vehicles are covered by K&N's Million-Mile Limited Warranty.

Fitment:
BMW 135i Base 2011
BMW 135i Base 2012
BMW 135i Base 2013
BMW 135is Base 2013
BMW 335i Base 2011
BMW 335i Base 2012
BMW 335i Base 2013
BMW 335i Base 2014
BMW 335i GT xDrive Base 2014
BMW 335i xDrive Base 2011
BMW 335i xDrive Base 2012
BMW 335i xDrive Base 2013
BMW 335i xDrive Base 2014
BMW X1 xDrive35i 2013
BMW X1 xDrive35i 2014
BMW X1 xDrive35i 2015