K&N 01-09 Audi A4/RS4/S4 Drop In Air Filter

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: 2002 Audi A4 Base 2002 Audi A4 Quattro Avant 2002 Audi A4 Quattro Base 2003 Audi A4 Base 2003 Audi A4 Cabriolet 2003 Audi A4 Quattro Avant 2003 Audi A4 Quattro Base 2004 Audi A4 Base 2004 Audi A4 Cabriolet 2004 Audi A4 Quattro Avant 2004 Audi A4 Quattro Base 2004 Audi A4 Quattro Cabriolet 2004 Audi S4 Avant 2004 Audi S4 Base 2004 Audi S4 Cabriolet 2005 Audi A4 Base 2005 Audi A4 Cabriolet 2005 Audi A4 Quattro Avant 2005 Audi A4 Quattro Base 2005 Audi A4 Quattro Cabriolet 2005 Audi S4 Avant 2005 Audi S4 Base 2005 Audi S4 Cabriolet 2006 Audi A4 Base 2006 Audi A4 Cabriolet 2006 Audi A4 Quattro Avant 2006 Audi A4 Quattro Base 2006 Audi A4 Quattro Cabriolet 2006 Audi S4 Avant 2006 Audi S4 Base 2006 Audi S4 Cabriolet 2007 Audi A4 Base 2007 Audi A4 Cabriolet 2007 Audi A4 Quattro Avant 2007 Audi A4 Quattro Base 2007 Audi A4 Quattro Cabriolet 2007 Audi RS4 Base 2007 Audi S4 Avant 2007 Audi S4 Base 2007 Audi S4 Cabriolet 2008 Audi A4 Base 2008 Audi A4 Cabriolet 2008 Audi A4 Quattro Avant 2008 Audi A4 Quattro Base 2008 Audi A4 Quattro Cabriolet 2008 Audi RS4 Base 2008 Audi RS4 Cabriolet 2008 Audi S4 Avant 2008 Audi S4 Base 2008 Audi S4 Cabriolet 2009 Audi A4 Cabriolet 2009 Audi A4 Quattro Cabriolet 2009 Audi S4 Cabriolet