Turbosmart GenV RacePort Blow Off Valve - Black (For Female Flange)The RacePort Series Blow Off Valve is famous for being an amazingly small and light BOV for supercharged competition level engines. Featuring our unique collar design and internal flow structures, it is 50% lighter and 25% smaller than the competition while flowing 330 CFM making it the highest flowing BOV of its type on the market. The Highest flowing BOV in the Turbosmart range has just been redesigned and now features our unique collar design.