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 X3 3.0si 2007
BMW X3 3.0si 2008
BMW X3 xDrive30i 2009
BMW X3 xDrive30i 2010
BMW Z4 Coupe 3.0si 2006
BMW Z4 Coupe 3.0si 2007
BMW Z4 Coupe 3.0si 2008
BMW Z4 Roadster 3.0i 2006
BMW Z4 Roadster 3.0i 2007
BMW Z4 Roadster 3.0i 2008
BMW Z4 Roadster 3.0si 2006
BMW Z4 Roadster 3.0si 2007
BMW Z4 Roadster 3.0si 2008
BMW Z4 sDrive30i 2009
BMW Z4 sDrive35i 2009