GFB WGA Internal Wastegate Actuator
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GFB WGA Internal Wastegate Actuator Subaru WRX STI 99-21
GFB has built a name on smart, adjustable boost control hardware, and the WGA is no exception. Featuring a larger diaphragm than the factory unit, it gives you far greater control over wastegate flap movement, keeping boost pressure locked in through spool up and high RPM on your Subaru WRX STI.
This listing covers the WGA actuator, part number 7305, designed as a direct bolt on replacement for Subaru WRX STI models from MY99-21. It also suits most single scroll IHI VF turbo applications.
Important: This is a tuning tool, not a plug and play upgrade. Fitting the WGA will increase boost pressure, so a professional retune is required after installation.
Key Features
- Larger diaphragm for stronger control authority over the wastegate flap
- Longer stroke and shorter housing height than rival actuators
- Turnbuckle pre-load adjustment for fine-tuning without swapping springs
- Adjustable base pressure range of approximately 35-165 kPa (5-24 psi)
- Supplied with three stainless steel springs (5, 7 and 10 psi rated)
- 5 psi and 10 psi springs fitted for a base pressure of around 103 kPa (15 psi)
- 7 psi spring included loose for further tuning options
Vehicle compatibility, OEM part numbers, and fitment notes are provided in the tabs above. Please ensure your vehicle's year, trim level, and turbo configuration are confirmed before ordering.
Not sure if this actuator suits your build? Contact our team at sales@chicaneaustralia.com.au for expert advice.
Vehicle Compatibility
| Make | Model | Chassis | Engine |
|---|---|---|---|
| Subaru | WRX | GDB | EJ207 |
| Subaru | STI | GDB | EJ257 |
| Subaru | STI | GRB | EJ257 |
| Subaru | STI | GVB | EJ207 |
| Subaru | WRX STI | VA | EJ257 |
Technical Specifications
| Spec | Value |
|---|---|
| Part Number | 7305 (GFB WGA) |
| Adjustable Base Boost Pressure Range | 34 kPa – 165 kPa (5–24 psi) |
| Spring Combination Range | 34 kPa – 152 kPa (5–22 psi) |
| Included Springs | 3 x stainless steel springs — 34 kPa (5 psi), 48 kPa (7 psi), 69 kPa (10 psi) |
| Factory Installed Spring Set | 5 psi + 10 psi springs (base pressure 103 kPa / 15 psi) |
| Additional Spring Supplied | 7 psi (48 kPa) spring included loose for further tuning |
| Adjustment Mechanism | Turnbuckle pre-load adjustment (tool-free fine tuning without spring swap) |
| Diaphragm | Larger than OEM diaphragm for increased control authority |
| Spring Material | Stainless steel |
| Fitment | Subaru WRX/STI MY99-21 (GDB/GRB/GVB/VA); also fits most single-scroll IHI VF turbos |
| Tuning Required | Yes — increases boost pressure, retune required |
No instructions available for this product.
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