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 525i Base 2004
BMW 525i Base 2005
BMW 525i Base 2006
BMW 525i Base 2007
BMW 525xi Base 2006
BMW 525xi Base 2007
BMW 528i Base 2008
BMW 528i Base 2009
BMW 528i Base 2010
BMW 528i xDrive Base 2009
BMW 528i xDrive Base 2010
BMW 528xi Base 2008
BMW 530i Base 2004
BMW 530i Base 2005
BMW 530i Base 2006
BMW 530i Base 2007
BMW 530xi Base 2006
BMW 530xi Base 2007
BMW Z4 M Coupe 2007
BMW Z4 M Coupe 2008
BMW Z4 M Roadster 2007
BMW Z4 M Roadster 2008