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

K&N washable, reusable High-Flow Air Filters feature a state-of-the-art design of layered, oiled cotton media engineered to improve airflow and capture contaminants, and are designed to provide an increase in horsepower. Each performance air filter is reusable, engineered to last for the entire lifespan of your vehicle, and backed by K&N's 10-Year/Million Mile Limited Warranty. K&N drop-in replacement filters are designed to install easily into your factory air box. Upgrade today and start enjoying superior airflow and superior performance from K&N's most popular product!
K&N's replacement High-Flow Air Filters are designed to increase horsepower while providing exceptional engine protection, and are covered by K&N's No-Hassle Lifetime Limited Warranty.

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