Kompact Shortie Plumb Back - VR08The Kompact Shortie Blow Off Valve for the Focus RS has been developed with the Focus's high boost pressure in mind, with the goal to improve performance and durability. Plastic OEM blow off valves like those on the RS have a track record of failures they leak, and they become brittle with age until they eventually crack, causing serious problems. Producing around 23 PSI of boost pressure in standard form, the Focus is already pushing the boundaries