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 318ti Base 1999
BMW 323Ci Base 2000
BMW 323i Base 1999
BMW 323i Base 2000
BMW 325Ci Base 2001
BMW 325Ci Base 2002
BMW 325Ci Base 2003
BMW 325Ci Base 2004
BMW 325Ci Base 2005
BMW 325Ci Base 2006
BMW 325i Base 2001
BMW 325i Base 2002
BMW 325i Base 2003
BMW 325i Base 2004
BMW 325i Base 2005
BMW 325xi Base 2001
BMW 325xi Base 2002
BMW 325xi Base 2003
BMW 325xi Base 2004
BMW 325xi Base 2005
BMW 328Ci Base 2000
BMW 328i Base 2000
BMW 330Ci Base 2001
BMW 330Ci Base 2002
BMW 330Ci Base 2003
BMW 330Ci Base 2004
BMW 330Ci Base 2005
BMW 330Ci Base 2006
BMW 330i Base 2001
BMW 330i Base 2002
BMW 330i Base 2003
BMW 330i Base 2004
BMW 330i Base 2005
BMW 330xi Base 2001
BMW 330xi Base 2002
BMW 330xi Base 2003
BMW 330xi Base 2004
BMW 330xi Base 2005
BMW M3 Base 2001
BMW M3 Base 2002
BMW M3 Base 2003
BMW M3 Base 2004
BMW M3 Base 2005
BMW M3 Base 2006
BMW X3 2.5i 2004
BMW X3 2.5i 2005
BMW X3 3.0i 2004
BMW X3 3.0i 2005
BMW X3 3.0i 2006