2015-2020 Subaru WRX Blow Off Valve (Turbo Smart)

It makes “swoosh” sound when you shift gears and releases excess air pressure built from your turbo. You can adjust the level of release, and therefore the sound by adjusting the knob.
Full description:
Kompact SmartPort explicitly made for the 2015 - 2020 WRX, features the innovative new Smart Port drive-by-wire friendly staging technology that gives you the response of a Plumb Back valve with the high-performance benefits of a vent-to-atmosphere valve. The SmartPort system involves a new manufacturing process, utilising specialised alloys and coatings and a revolutionary new vent-to-atmosphere trumpet design. These unique designs allow for a swift response while providing enhanced sealing. The result is quicker spool-up and better performance on modern drive-by-wire vehicles.

Smart Trumpet Design
Turbosmart’s SmartPort trumpet allows a softer spring in the body of the BOV to aid in valve response to the Plumb Back Port while still retaining the ability to vent to the atmosphere. W

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