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This Z32 specific kit includes TWO SSQV4 Blow-Off Valves.
HKS Super SQV (Super Sequential Blow Off Valve) uses a unique sequential valve structure and a differential pressure control system, which allows for a broad operation range from low boost to high boost. All vehicle specific Super SQV kits include both the HKS Triple Fin Sound insert and Recirculation insert.
You won't regret purchasing this set as it's one of the nicest Z32 specific BOV Kits on the market!