Features: 1.100% New Aftermarket Blow off Valve with Premium Quality. 2.Made of high quality aluminum alloy material, corrosion resistant, reliable for long time use. 3.Improves reaction of the turbine, increases the torsion of blow off valve, prolong the turbo engines' service life. 4.To prevent the turbo's compressor from going into surge. When the throttle is closed rapidly, the airflow is quickly reduced, causing flow instability and pressure fluctuations. 5.When the throttle is closed rapidly, the BOV vents boost in the intake tract to atmosphere to relieve the pressure, helping to eliminate surge. Specification: Features: _x000D_ 100% New Aftermarket Blow off Valve with Premium Quality. _x000D_ Made of high quality aluminum alloy material, corrosion resistant, reliable for long time use. _x000D_ Improves reaction of the turbine, increases the torsion of blow off valve, prolong the turbo engines' service life. _x000D_ To prevent the turbo's compressor from going into surge. When the throttle is closed rapidly, the airflow is quickly reduced, causing flow instability and pressure fluctuations. _x000D_ When the throttle is closed rapidly, the BOV vents boost in the intake tract to atmosphere to relieve the pressure, helping to eliminate surge. _x000D_ Bolt-on design for ease of installation, fit for Subaru Impreza WRX EJ20 STI 2002-2007. _x000D_ _x000D_ _x000D_ Specification: _x000D_ Condition: 100% New _x000D_ Material: Aluminum Alloy _x000D_ Color: Blue _x000D_ Quantity: 1pc _x000D_ Package Weight: 441g / 15.6oz _x000D_ Fitment: _x000D_ for Subaru Impreza WRX 2.0L Turbo 2002-2005 (EJ205 Engine) _x000D_ for Subaru Impreza WRX 2.5L Turbo 2006-2007 (EJ255 Engine) _x000D_ for Subaru Impreza WRX STI 2.5L Turbo 2004-2016 (EJ257 Engine) _x000D_ for Subaru Forester XT 2.5L Turbo 2004-2008 (EJ255 Engine) _x000D_ _x000D_ _x000D_ Package Included: _x000D_ 1 * Blow Off Valve PackageList: