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.
Installation Instructions


This Part Fits:

Year	Make	Model	Submodel
2002-2008	Audi	A4	Base
2003-2009	Audi	A4	Cabriolet
2002-2008	Audi	A4 Quattro	Avant
2002-2008	Audi	A4 Quattro	Base
2004-2009	Audi	A4 Quattro	Cabriolet
2007-2008	Audi	RS4	Base
2008	Audi	RS4	Cabriolet
2004-2008	Audi	S4	Avant
2004-2008	Audi	S4	Base
2004-2009	Audi	S4	Cabriolet