GFB 99-21 Subaru WRX STI WGA Wastegate Actuator (Tune Required)

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

Enhance your Subaru WRX STI with the Go Fast Bits GFB7305 WGA Wastegate Actuator, engineered for superior performance and precise boost management. Featuring an industry-first silicone/Nomex diaphragm with a new bead retention design, this actuator delivers the largest effective area in a compact size, providing enhanced control over the wastegate flap. This results in faster spool-up, reduced boost taper at high RPM, and more stable boost control, making it an ideal upgrade for enthusiasts seeking maximum turbo efficiency.
Designed with a 18mm stroke, the GFB WGA is suitable for controlling large internal wastegates or for increasing boost pressure without changing springs. Its unique pivoting rod guide, machined from high-performance PEEK polymer, minimizes height within the actuator body, ensures low friction, and offers outstanding wear resistance. The compact design keeps the overall size minimal, making it the shortest actuator on the market while maintaining robust control capabilities.
Adjustability is a key feature of the GFB WGA, enabling quick and precise tuning. It includes three stainless steel springs, offering a range from 5 to 22 psi, and a turnbuckle adjustment for fine-tuning pre-load without the need to swap springs or remove the actuator. This makes setting the ideal boost pressure straightforward and time-efficient, providing more control and flexibility for your turbo setup.
Compatible with 2010-2016 Subaru Impreza and WRX STI models, the GFB WGA replaces the factory actuator, supporting higher boost pressures and delivering faster spool-up, less boost taper, and more stable boost levels. Whether you’re upgrading for increased performance or tuning for specific boost targets, this high-performance internal wastegate actuator offers a reliable solution to optimize your turbocharged Subaru's capabilities.

Features:

• Industry-first diaphragm design with bead retention for larger effective area in a compact size

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

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

• Shortest actuator on the market with minimal bulk for space-saving installation

• Turnbuckle adjustment for quick and precise pre-load tuning without spring swaps

• Includes three stainless steel springs for a boost range of 5-22 psi

• Bolt-on design with universal kits available for easy installation

• Supports higher boost pressure, faster spool-up, and more stable boost control

• Compatible with Subaru Impreza and WRX STI models from 2010 to 2016

Fitment:
Subaru Impreza WRX STI 2004
Subaru Impreza WRX STI 2005
Subaru Impreza WRX STI 2006
Subaru Impreza WRX STI 2007
Subaru Impreza WRX STI 2008
Subaru Impreza WRX STI 2009
Subaru Impreza WRX STI 2010
Subaru Impreza WRX STI 2011
Subaru Impreza WRX STI 2012
Subaru Impreza WRX STI 2013
Subaru Impreza WRX STI 2014
Subaru WRX STI Base 2015
Subaru WRX STI Base 2016
Subaru WRX STI Base 2017
Subaru WRX STI Base 2018
Subaru WRX STI Base 2019
Subaru WRX STI Base 2020
Subaru WRX STI Base 2021
Subaru WRX STI Launch Edition 2015
Subaru WRX STI Limited 2015
Subaru WRX STI Limited 2016
Subaru WRX STI Limited 2017
Subaru WRX STI Limited 2018
Subaru WRX STI Limited 2019
Subaru WRX STI Limited 2020
Subaru WRX STI Limited 2021
Subaru WRX STI S209 2019
Subaru WRX STI Series.HyperBlue 2016
Subaru WRX STI Type RA 2018