Get into a rhythm with upgraded Stanza Blow Off Valve. Make that turbo sing with a new Blow Off Valve. New Stanza Blow Off Valve will have you singing in the aisles. A Blow Off Valve releases all the built up pressure from the turbo and boosts power. These Stanza Blow Off Valve are of the highest quality. A great benefit to having a Blow Off Valve is the unique sound you get when shifting. Take your turbo to the next level with an upgraded Blow Off Valve.