GFB - Go Fast Bits Turbocharger Blow Off Valve

GFB Go Fast Bits: The Engineers Behind the Blow Off Valve

Go Fast Bits (GFB) has built its reputation on one simple principle: Performance Without Compromise. Turbocharger blow off valves are where that philosophy is most visible. Founded in the late 1990s by engineer John Adrian after he grew frustrated with the poor quality of aftermarket parts available for his Subaru WRX, GFB set out to design blow off valves that delivered genuine performance gains without the drivability headaches common to other brands.

What sets GFB apart in the BOV segment isn't just build quality — it's the engineering innovations they pioneered and patented. GFB pioneered the dual-port blow-off valve design back in 1999, a layout that separates atmosphere and recirculation venting ports and has since become the industry standard. Then, in 2001, they followed that up by patenting the Venting Bias Adjustment System, which allows the ratio of air vented through either outlet to be infinitely varied. This gives drivers precise control over both sound level and driveability, making GFB BOVs compatible even with sensitive engine management systems that would otherwise suffer stalling or backfiring.

Key Product Lines: DV+, VTA, and More

GFB's blow off valve lineup spans a wide range of applications and performance goals. Their full catalogue of BOV and diverter valve models includes the Mach 2, Hybrid, Respons TMS, Deceptor Pro II, DV+, VTA, DVX, SXV, and SV52 — something for nearly every turbocharged platform.

• DV+ (Diverter Valve Plus): Designed as a direct replacement for factory solenoid-type diverter valves, the DV+ retains ECU control and the OEM solenoid while replacing the weak plastic valve internals with CNC-machined billet components. GFB pioneered "pilot operation" in the DV+, repurposing the factory solenoid to control pressure behind the piston rather than the piston itself — speeding up response time, increasing actuation force, and enabling progressive piston movement for smoother boost transitions. The DV+ recirculates air to atmosphere, keeping things quiet for daily drivers.
• VTA (Vent To Atmosphere): The VTA builds on the proven DV+ platform but adds atmosphere venting, delivering the signature turbo blow-off sound alongside all the same performance benefits. The VTA is more "discerning" about how much air it vents — only releasing what's needed to eliminate pressure spikes and compressor surge, rather than opening fully like a factory diverter valve.
• Respons TMS: A traditional pneumatic BOV built around GFB's Turbo Management System technology, the Respons TMS suits a broad range of turbocharged vehicles and is adjustable for sound and performance balance.
• SXV: Purpose-built for extreme reliability and high-boost applications, the SXV range is engineered for superior boost holding and is even available for off-road turbocharged platforms like the Polaris RZR.

Turbo Management System (TMS) Technology

Every GFB blow off and diverter valve features their proprietary Turbo Management System (TMS) technology. TMS controls the flow rate through the valve so that when the throttle is closed, the piston opens to relieve pressure and prevent compressor surge — then begins closing again as pressure drops, preserving a small amount of boost in the intercooler. This means when the throttle reopens, the turbo returns to peak boost faster, sharpening gear-change response and reducing lag. It's an engineering detail that makes a real, measurable difference on both street and track.

With bolt-on fitment kits for popular platforms including the Subaru WRX & STi, Mitsubishi Lancer EVO, Nissan Skyline, Audi 1.8T, Volkswagen 1.8T, and many more, GFB makes it straightforward to upgrade from the factory unit without permanent modifications. Browse the full GFB Go Fast Bits brand page to explore their complete lineup, or shop the full range of Turbocharger Blow Off Valves to compare options across brands.