HKS Racing SQV Sequential Blow Off Valve Kit | UniversalHKS Super SQV (Sequential Blow Off Valve) uses a unique sequential valve structure and a differential pressure control system, which allows for a broad operating range from low boost to high boost. Its Pull Type relief design ensures stable operation regardless of the amount of boost pressure. The Super SQV will support new generations of turbocharged vehicles. Typical push type blow off valves require spring load settings for each vehicle