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SKU: 71008-AF013V | UPC: 4957266265611
HKS Super SQV4 Blow Off Valve + Return Kit for 2008-2014 Subaru Impreza WRX STI (GRB) & 2010-2012 Forester STI (GRF)
The HKS Super SQV4 + Return Kit transforms boost management on Subaru GRB and GRF turbo models. This direct-fit assembly replaces the factory diverter valve on Impreza WRX STI and Forester STI for faster pressure venting and smoother turbo operation. Drivers experience quicker throttle response reduced lag and distinctive sound under boost.
Key Features
- Dual Valve Structure: Inner valve handles low-pressure response while outer valve supports high-boost flow up to 2.0 kgf/cm² for full-range performance
- Pull-Type Mechanical Operation: Direct spring-loaded action uses engine vacuum unaffected by boost pressure or ECU signals for instant relief
- Progressive Spring Mechanism: Three included springs allow tuning from 0.5 to 1.3 kgf/cm² to match engine modifications and boost levels
- Recirculation Piping Kit: Complete return hose and fittings route vented air back to intake pipe preventing surge error codes and compressor damage
- Aluminum Die-Cast Body: Anodized finish resists corrosion with fluorosilicone rubber diaphragm for long-term durability and consistent sealing
Product Notes
- Direct bolt-on replacement requires no cutting or fabrication on stock turbo setups
- Adjustable discharge direction for hood clearance and sound preference
- Handle with care during shipping to protect fittings and diaphragm
Installation Notes
- Professional installation recommended.
- Disconnect factory solenoid valve and mounting bracket before fitting
- Compatible with stock intake manifold and turbo outlet flange on GRB/GRF
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2014 | Subaru | Impreza | WRX STI (GRB) |
| 2010-2012 | Subaru | Forester | STI (GRF) |
Why Choose HKS?
- Over 50 years developing JDM turbo systems for street and track
- Proven in motorsports with real-world dyno-tested components
- Precision CNC-machined parts ensure leak-free operation under high pressure
Frequently Asked Questions
-
Q: Will this fit US-market 2008-2014 Impreza WRX STI?
A: Yes it bolts directly to GRB chassis turbo outlet and intake pipe on USDM EJ25 turbo models -
Q: What materials are used in construction?
A: Die-cast aluminum body with hard anodizing plus fluorosilicone diaphragm and stainless fittings for heat and chemical resistance -
Q: Does installation require tuning or ECU changes?
A: No tuning needed with recirculation kit as it returns air to intake preventing check engine lights or limp mode
Shipping & Handling
- Method: UPS Ground / FedEx Ground
- Availability: In stock - ships same or next business day
- Packaging: Secure HKS box 7.1 x 5.1 x 3.9 inches
- Weight: 1.1 lbs product / 1.65 lbs shipping
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HKS
HKS is a Japanese manufacturer of premium performance parts founded in 1973 that has been at the forefront of turbocharged engine development, producing turbochargers, exhaust systems, engine management, intercoolers, and supporting performance components for some of the most iconic Japanese sports cars ever built. The brand's GT and GTIII turbocharger series, Super Sequential Blow Off Valves, and Racing Suction intake kits are recognized globally as benchmark-quality products that combine Japanese manufacturing precision with decades of motorsport development experience. HKS products are particularly well-known in the Toyota Supra, Mitsubishi Evo, Subaru STI, Nissan GT-R, and Honda NSX communities, where the brand's heritage in building the world's fastest versions of these cars has created a loyal following among enthusiasts who want the best available components. From a simple racing suction kit to a complete GT turbo with intercooler and ECU tune, HKS provides an end-to-end perf...
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