Go Fast Bits GFB 7305 Subaru WRX STI WGA Wastegate Actuator – Adjustable Boost Control for Enhanced Performance

Massive Performance, Compact Size. • Industry-first diaphragm design - the WGA’s Silicone/Nomex diaphragm uses a new bead retention design that achieves the largest effective area with the smallest possible outside diameter. This keeps the overall size of the WGA down whilst giving it more control authority over the wastegate flap, resulting in better boost control. It’s like telling your turbo what to do instead of pleading with it! • Longest stroke – with 18mm of rod travel, the WGA is suitable for controlling the largest of internal wastegates, or the extra travel can be used to further increase boost pressure without having to change springs. • Unique pivoting rod guide – machined from PEEK (an extremely high-performance engineering polymer), the encapsulated spherical rod guide takes up significantly less height in the actuator body than other designs, whilst offering low friction and superior wear resistance. • No unnecessary bulk – sounds obvious, but attention to detail in the design means the WGA is the shortest actuator on the market. More Adjustable, More Easily. Setting the base spring pressure correctly for your application can have significant performance benefits, so we made sure the WGA offers the best adjustability on the market! We supply 3 stainless steel springs that can be used in any combination ranging from 5psi to 22psi, but that’s only the beginning. Whilst other brands may offer more spring options (sold separately), changing springs to fine-tune boost pressure is time consuming and quite frankly, a pain. That’s why we added another industry first - turnbuckle adjustment. The long stroke of the WGA means more adjustment range for the spring pre-load, so you can fine-tune your base boost pressure in a matter of minutes without swapping springs or removing the actuator. Available in bolt-on or universal kits - Check the GFB website for details. Bolt on high performance internal wastegate actuator. The WGA replaces the factory turbo’s actuator, offering a larger diaphragm and adjustable base spring pressures ranging from 5-22psi to get the most out of your turbo. Subaru: WRX STi MY99-22

• WGA Benefits (compared to a factory-fitted actuator): • Faster spool up • Less boost taper at high RPM • More stable boost control • Customizable spring rates • Supports higher boost pressure

The Go Fast Bits GFB 7305 Wastegate Actuator is engineered specifically for Subaru WRX STI models from 1999 to 2022, offering a significant upgrade over factory components. Designed for enthusiasts seeking faster spool times and more stable boost control, this high-performance internal wastegate actuator replaces your vehicle’s stock unit with a larger diaphragm and an innovative diaphragm design that maximizes control authority. The industry-first Silicone/Nomex diaphragm features a new bead retention system, enabling the largest effective area with the smallest outside diameter. This compact design maintains a low profile while providing precise control over the wastegate flap, resulting in improved boost management and responsiveness. The robust construction and advanced materials ensure long-lasting performance even under demanding conditions, supporting higher boost pressures and more aggressive tuning.
The actuator’s 18mm stroke length offers substantial travel, making it suitable for controlling large internal wastegates. The extended stroke allows for increased boost pressure without the need to change springs, providing tuners with greater flexibility. The unique pivoting rod guide, machined from PEEK—a high-performance engineering polymer—reduces height and friction within the actuator body. This spherical guide ensures smooth operation and superior wear resistance, contributing to consistent performance over time. Its minimal bulk means it fits neatly within the engine bay, avoiding unnecessary clutter and simplifying installation.
Adjustability is a key feature of the GFB WGA, with a turnbuckle mechanism that allows for quick and precise fine-tuning of boost pressure. The kit includes three stainless steel springs, which can be combined to achieve a base pressure ranging from 5 to 22 psi. Unlike other models requiring spring swaps for tuning, the turnbuckle adjustment offers a convenient way to modify boost levels without removing the actuator or changing springs, saving time and effort during setup. The GFB WGA is available in bolt-on or universal configurations, making it adaptable to various setups and preferences. Designed to support higher boost pressures and more aggressive tuning, this actuator enhances spool-up times, reduces boost taper at high RPM, and provides more consistent boost control.
Overall, the Go Fast Bits GFB 7305 wastegate actuator is an ideal upgrade for Subaru WRX STI owners aiming to maximize their turbo’s potential. Its innovative design, extensive adjustability, and compact form factor make it a reliable and performance-focused choice for serious enthusiasts seeking to push their vehicle’s limits while maintaining precise boost control.

Features:

• Industry-first Silicone/Nomex diaphragm with bead retention design for maximum control authority

• Long 18mm stroke length suitable for controlling large internal wastegates or increasing boost pressure

• Pivoting rod guide machined from PEEK for low friction and high wear resistance

• Compact, lightweight design minimizes bulk within the engine bay

• Turnbuckle adjustment allows quick fine-tuning of boost pressure without spring swaps

• Includes three stainless steel springs for a customizable boost range from 5 to 22 psi

• Bolt-on or universal kits available for versatile installation

• Supports higher boost pressures for increased turbo performance

• Enhances spool-up time and stabilizes boost at high RPMs

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1