GFB - Go Fast Bits Turbocharger Wastegate

GFB Go Fast Bits Turbocharger Wastegates: Precision Boost Control Built to Last

When it comes to controlling boost pressure in a turbocharged engine, few components are more critical — or more often overlooked — than the wastegate. Go Fast Bits (GFB) has built a well-earned reputation in the turbo performance world by engineering wastegates that solve real problems: boost drop-off at high RPM, unstable boost curves, and the inability to hit and hold target boost. Their turbocharger wastegate lineup spans both external wastegates and internal wastegate actuators (WGAs), giving builders and tuners a complete toolkit regardless of their platform.

The EX Series: External Wastegates That Don't Compromise on Flow or Fitment

GFB offers a range that are among the most compact external wastegates in their class, being shorter in height than their closest rivals without sacrificing flow. That's not marketing language — it's a genuine engineering achievement. All GFB wastegates feature an investment cast body made from 253MA chromium-nickel stainless steel, a CNC machined billet stainless valve, and all stainless steel weld-on fittings and hardware, whilst the diaphragm is Nomex-reinforced silicone.

The EX lineup covers multiple valve diameters to match different turbo setups and horsepower targets. The EX38 (38mm) is a standout for tight engine bays: standing only 93mm tall, the EX38 is shorter than its nearest rival — truly the most compact wastegate range on the market — with an actuator housing CNC machined from billet 6061 aluminum and a body, valve, seat, and all mounting hardware CNC machined from high-temp stainless steel. For higher-flow applications, the EX44 and EX50 step up the valve diameter while maintaining GFB's compact form factor. Flow tests show that for the same valve lift, the EX50 outflows its nearest competitor by 18%.

All external wastegates use a V-band clamp mounting system and are supplied with three springs that can be ganged together in various combinations to allow boost pressures of 7, 9, 13, 16, 20, 22, and 29 psi — the largest range of boost pressures available off-the-shelf. This spring-stacking system is a significant advantage for tuners who want flexibility without ordering multiple wastegates.

The WGA: Upgrading Internal Wastegate Actuators

Not every turbocharged platform uses an external wastegate — many factory turbo setups rely on an internal wastegate controlled by an actuator. When diving into the world of increasing boost pressure, the limits of a factory-fitted wastegate actuator can soon become apparent. Even with electronic boost control it is not always possible to overcome wastegate issues such as boost drop-off at high RPM, unstable boost curve, or an inability to achieve target boost.

GFB's WGA (Wastegate Actuator) addresses this directly with an industry-first diaphragm design. The WGA's Nomex-reinforced silicone diaphragm is designed to achieve the largest effective diaphragm area with the smallest possible outside diameter — giving the WGA more control authority over the wastegate flap, resulting in better boost control. Attention to detail in the design also makes the WGA the shortest actuator on the market.

Built for Reliability, Backed by a Lifetime Warranty

Established out of resourcefulness, GFB's Chief Engineer John Adrian founded Go Fast Bits in the late 1990s while seeking to enhance the performance of his first Subaru WRX — because existing products failed to meet his high standards for quality and performance. That founder-driven commitment to engineering integrity still shows in every wastegate GFB produces. If your GFB product fails as a result of defective materials or faulty workmanship whilst you remain the original owner, GFB will repair or replace it — an industry-leading lifetime warranty that underscores the brand's confidence in its own work.

Whether you're chasing consistent boost on a street car or building a high-horsepower custom turbo setup, GFB's wastegate range delivers the control, durability, and compact engineering that serious tuners demand. Browse the full selection of GFB Go Fast Bits products or explore the complete turbocharger wastegate category to find the right fit for your build.