(1) PERRIN Cold Air Intake Tube. (1) PERRIN Foam Filter. 2004-2005 STI 2006-2007 STI 2008-2010 STI 2011-2014 STI 2015-2021 STI. (1) PERRIN Intake Mounting Bracket. The airflow straightener improves MAF readings by forcing incoming airflow into a uniform profile.
