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 airflow straightener improves MAF readings by forcing incoming airflow into a uniform profile.
