Turbo XS Hybrid Blow Off Valve Type XS Subaru WRX 2015-2021 | W15-XS-HYB STI_2004-2007 Fitment-compatible across A/R values within

Fitment-compatible across A/R values within the same casting family

bolt on dampers that allow you to ditch your hood prop or replace your boring stock dampers with real carbon fiber

Add horsepower and torque to your WRX or STI with the new Mishimoto Subaru WRX/STI Performance Air Intake

If you are planning on making 500whp or less

Turbo XS Hybrid Blow Off Valve Type XS Subaru WRX 2015-2021 | W15-XS-HYB STI_2004-2007 Fitment-compatible across A/R values withinFitment: Subaru WRX 2015 2021 Not too loud and not too quiet, the W15 XS HYB from TurboXS is the valve for you if you want an upgraded Blow Off Valve that you can hear when you want to but not when you don't. This valve is designed to vent partly to atmosphere and partly back to the intake giving you the "best of both worlds". This valve comes complete with everything you need to replace your stock bypass valve.