The Turbosmart Supersonic Blow-Off Valve (BOV) is designed for racers and dedicated automotive enthusiasts seeking maximum sound and performance. This full atmospheric BOV delivers superior flow thanks to its high-performance design and is known for the unmistakable Supersonic sound. It features a tool-free adjustment system via a rotating cap and a positive-seal piston for reliable operation. Ideal for those who want their turbocharged vehicle to stand out, the Supersonic is Turbosmart’s loudest BOV.