Turbosmart Blue Supersonic Blow Off Valve Subaru WRX 2002-2007 / STI 2004-2021 / Forester XT 2006-2008 discontinued-with-inventory 5L STi headgasket is multi-layered

5L STi headgasket is multi-layered steel

Freeing up airflow into the turbocharger is key to making power

less gear noise and consistent viscosity

Note: If you have a 2005-2009 Legacy GT or Outback XT

Turbosmart Blue Supersonic Blow Off Valve Subaru WRX 2002-2007 / STI 2004-2021 / Forester XT 2006-2008 discontinued-with-inventory 5L STi headgasket is multi-layeredPart #: TS 0205 1315 Turbosmarts loudest blow off valve, the Supersonic is sure to turn heads wherever you are. This valve is ideal for both street and race cars and produces the signature Supersonic sound. It is fully atmospheric and features a "tool free" adjustment setup by turning the cap of the valve. Included is an aluminum weld on flange and quick release v band clamp.