🔧 Product Description
The GFB Deceptor Pro II T9500 Diverter Valve is a next-generation electronically controlled blow-off valve system designed for early Subaru turbo platforms including WRX, STi, Legacy B4, and Forester GT/XT models (MY98–04).
It combines OEM-style integration with full in-cabin control, allowing drivers to adjust blow-off sound and venting behaviour on demand — from silent recirculation to full atmosphere venting.
⚙️ Key Features
- In-cabin electronic BOV control system
- Adjustable venting bias (silent → loud on demand)
- Compact design for factory-style fitment
- Direct bolt-on replacement for OEM diverter valve systems
- High-torque electric motor for precise valve control
- Precision sealed bearing and low-friction gear train
- End-point adjustment for maximum vent setting
- Complete plug-and-play wiring harness included
- Durable CNC-machined internal components
🏁 Performance Benefits
🎛️ Full Sound Control From Inside the Cabin
Adjust valve behaviour in real time without opening the bonnet — switch from OEM quiet operation to aggressive blow-off sound instantly.
⚡ Improved Boost Response
Faster valve actuation helps maintain boost stability between gear changes and throttle transitions.
🔒 Stronger Boost Control & Reliability
Reinforced internal design improves sealing and reduces boost leakage compared to factory diverter valves.
🚀 Customisable Driving Experience
Dial in exactly how your turbo system behaves depending on driving style or conditions.
🔬 How It Works
The Deceptor Pro II uses an electronically driven actuator system to control venting bias:
- Electric motor adjusts valve position in real time
- In-cabin controller sets venting percentage
- ECU retains full control of boost strategy
- End-stop calibration defines maximum atmosphere venting
👉 Result: precise, driver-controlled boost release with OEM integration.
🎛️ In-Cabin Control System
- Backlit rotary dial controller
- Adjustable venting volume (silent → loud)
- Real-time response adjustment
- Easy mounting inside cabin
👉 No vacuum tuning or manual spring changes required.
🚗 Vehicle Applications
Subaru
- WRX (MY99–00) GC / GF platforms
- WRX Wagon & Sedan (GC8 / GF8)
- STi (MY99–00)
- Legacy B4 (BE/BH/BT EJ20TT)
- Forester GT / XT (MY98–04)
🔩 Specifications
- Product Type: Electronic diverter/blow-off valve
- Technology: Deceptor Pro II electronic TMS system
- Control: In-cabin adjustable motor-driven system
- Fitment: Direct bolt-on (vehicle-specific kit)
- Material: CNC-machined internal components
- Brand: Go Fast Bits (GFB)
🛠️ Installation Notes
- Replaces factory diverter valve system
- Includes full wiring and control module
- No vacuum tuning required
- ECU remains fully functional
- Recommended for performance or modified turbo setups
💡 Why Choose the Deceptor Pro II?
If you want:
- Full control over turbo sound inside the cabin
- OEM drivability with adjustable performance feel
- A premium electronic upgrade over standard BOVs
- Instant switching between quiet and aggressive modes
👉 The Deceptor Pro II delivers unmatched control and flexibility.
🏆 Perfect For
- Early Subaru turbo builds (WRX / STi / Legacy / Forester)
- Enthusiasts wanting adjustable sound and performance
- Street + weekend performance cars
- Drivers wanting OEM integration with aftermarket control
✅ Summary
The GFB Deceptor Pro II T9500 Diverter Valve is a premium electronic boost control solution for early Subaru turbo platforms, offering in-cabin adjustable blow-off sound, improved boost response, and OEM-level integration in a compact, bolt-on system.
