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HKS 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. 1 High Quality Aluminum Die-Cast BodySilver-coated aluminum die-cast body. Combines the ultimate in looks and durability in the engine compartment. 2 High Stiffness Metal Die-Cast ValveSecondary valve main portion is made of die cast metal. Reliable operation with beautiful looking. 3Triple Fin design produces “Super Sound”Triple Fins set at the center of the funnel produces a dynamic and aggressive sound. An optional special Round Fin can be purchased separately for sound tuning.