K&N's replacement air filters for the Subaru WRX/STI are designed to increase horsepower and acceleration while providing excellent filtration. K&N filters are custom designed to fit into your existing factory air box for simple, fast installation. K&N stock replacement air filters for street vehicles are covered by a Million-Mile Limited Warranty. K&N Filters use oil to provide filtration, and can be washed and recharged using the K&N cleaning kit (sold separately).
NOTE: This item is not CARB legal and not for sale or street use in CA and CARB states. This kit cannot ship to CA.
Subaru STI 2004-2007
Subaru WRX 2002-2007