K&N 04-07 Subaru STi K&N 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: Subaru Baja Turbo 2004 to 2006 Subaru Forester Sports 2.5 X 2008 Subaru Forester Sports 2.5 XT 2008 Subaru Forester X 2003 to 2008 Subaru Forester X L.L. Bean Edition 2006 to 2008 Subaru Forester XS 2003 to 2005 Subaru Forester XS L.L. Bean Edition 2005 Subaru Forester XT 2004 to 2005 Subaru Forester XT Limited 2006 to 2008 Subaru Forester XT Premium 2005 Subaru Impreza RS 1999 Subaru Impreza WRX 2004 to 2005 Subaru Impreza WRX STI 2004