2002-2003 WRX 2004-2005 WRX 2006-2007 WRX 2008-2010 WRX 2011-2014 WRX 2015-2021 WRX 2022-2024 WRX. 2004-2005 STI 2006-2007 STI 2008-2010 STI 2011-2014 STI 2015-2021 STI. The restrictive factory air filter and air intake housing are replaced by the K&N Typhoon air intake which is designed to dramatically reduce air flow restriction as it smoothes and straightens air flow.
