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SKU: 71008-AF013 | UPC: 4957266265093
HKS 2008-2011 Subaru STI SSQV4 BOV Kit
The HKS SSQV4 BOV Kit replaces the stock blow-off valve on 2008-2011 Subaru Impreza WRX STI models with a sequential valve design that vents excess boost pressure smoothly for faster throttle response and a sharp audible release. This complete kit includes STI-specific intake pipe, flange, and hardware for a direct bolt-on installation. Drivers experience reliable operation under high boost levels up to 29 psi while reducing compressor surge.
Key Features
- Sequential Dual-Valve Design: Main valve opens with high lift for instant response, secondary valve follows for progressive release, ensuring stable boost control across RPM range
- High Flow Capacity: Handles 500+ hp setups with minimal restriction, supporting larger turbos and increased boost pressures common in STI tuning
- Lightweight Die-Cast Aluminum: Titanium-like black anodized finish resists corrosion, weighs only 1.1 lbs for the valve alone to cut hood-down weight
- Adjustable Spring Preload: Five included springs allow tuning from 5-29 psi, matching stock ECU or aftermarket maps precisely
- STI-Specific Piping Kit: Custom aluminum pipe with O-ring seals connects directly to factory turbo outlet and intake manifold for leak-free performance
Product Notes
- Operate in vent-to-atmosphere mode for sound or recirculate with optional plug for quiet operation
- Inspect diaphragm annually for high-boost use to maintain seal integrity
- Kit ships fully assembled with all fittings, no additional parts needed
Installation Notes
- Professional installation recommended.
- Remove stock BOV and pipe, bolt new assembly in 30-45 minutes with basic tools
- Uses factory mounting holes and includes stainless hardware for secure fit
This Part Fits
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2008-2011 | Subaru | Impreza | WRX STI |
Why Choose HKS?
- HKS engineers products for Subaru motorsport applications worldwide
- Manufactured to exacting JDM standards with rigorous dyno testing
- Backed by decades of turbocharger development experience
Frequently Asked Questions
-
Q: Will this fit 2008-2011 STI Limited or hatchback models?
A: Yes, direct fit for all USDM 2008-2011 Impreza WRX STI sedan and hatchback variants with EJ257 turbo -
Q: What material is the valve body?
A: High-strength die-cast aluminum with hard black anodized coating and fluorosilicone diaphragm for durability -
Q: What is the warranty and install process?
A: HKS offers 1-year limited warranty, installation is bolt-on using provided gasket and clamps, ECU retune advised for optimal boost
Shipping & Handling
- Method: UPS Ground or FedEx
- Availability: In stock - ships same or next business day
- Packaging: Secure HKS box measuring 11.8 x 9.1 x 5.9 inches
- Weight: 3.4 lbs
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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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Looks pretty nice, pricing was good and the reinforcement is a big plus.
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