Turbosmart Blow-off Valves are manufactured with a focus on performance and reliability. Turbosmart Blow-off valves (also known as diverter valves, recirc valves, DV’s etc) are made in Australia. Built and machined from tough, durable billet aluminium. With a complete range of solutions. Turbosmart offers OE Replacement and heavy-duty upgrades through all performance and street applications, race and of course for motorsport use.