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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