Description
Product description
HKS Super SQV IV Blow-Off Valve for Subaru Impreza GRB GRF GVB GVF
The HKS Super SQV4 Blow-Off Valve is a vehicle-specific performance upgrade designed for selected Subaru Impreza STI GRB, GRF, GVB and GVF models.
Its sequential pull-type valve system provides fast, controlled boost-pressure release when the throttle closes. This helps reduce compressor surge while delivering the distinctive HKS blow-off valve sound.
The die-cast aluminium body and metal valve construction provide reliable operation under demanding turbocharged engine conditions. The standard triple-fin insert produces an aggressive discharge sound, while optional sound inserts allow the tone to be changed.
Key Features
- Sequential dual-valve design: Uses primary and secondary valves to control boost release across a wide pressure range.
- Pull-type relief valve: Boost pressure helps keep the valve securely closed under acceleration, reducing the risk of leakage.
- Fast pressure release: Responds quickly when the throttle closes to help reduce compressor surge.
- Die-cast aluminium body: Provides strength, durability and a premium silver finish.
- Metal valve construction: Designed for reliable operation under demanding engine-bay conditions.
- Triple-fin sound insert: Produces the distinctive HKS discharge sound.
- Suitable for standard and tuned vehicles: Designed to operate across a wide range of boost pressures.
How the Sequential Valve System Works
- During acceleration: Both valves remain closed, allowing the turbocharger to build and maintain boost pressure.
- Initial throttle lift: The primary valve opens to release the first stage of excess pressure.
- Higher pressure release: The primary valve activates the secondary valve, increasing discharge capacity when required.
Vehicle Fitment
- Subaru Impreza WRX STI GRB
- Subaru Impreza WRX STI GRF
- Subaru Impreza WRX STI GVB
- Subaru Impreza WRX STI GVF
Important: Vehicle compatibility may vary by year, market and engine specification. Please confirm the exact HKS part number and vehicle application before ordering.
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