HKS SSQV4 (Silver) Blow off Valve - Subaru WRX VAG 15 - 21 A90 over the factory pipe

over the factory pipe

the acceleration will be greatly increased and launches will far more aggressive

erratic lean AFR spikes

stock second-cat (front pipe) remains in place

HKS SSQV4 (Silver) Blow off Valve - Subaru WRX VAG 15 - 21 A90 over the factory pipeThe HKS Super SQV4 (Super Sequential Blow Off Valve) for the Subaru WRX VA uses a dual stage sequential pull type valve to vent excess boost pressure the moment the throttle lifts, preventing compressor surge across the full boost range from low to high. A differential pressure control system governs opening precisely without the spring load compromise of push type valves, and the triple fin funnel produces the signature HKS induction sound. Features