Our latest Kompact SmartPort explicitly made for the 2015 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, utilizing specialized 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.Dual Port vents both to the atmosphere & back into the air intake. Ports with sequential timing allow quieter operation during normal driving, while getting all the benefits of a vent-to-atmosphere BOV under race conditions.