Go Fast Bits Subaru WRX/STi 99-00, B4 Legacy, GT/XT Forester 98-04 Hybrid Dual Outlet Blow-Off Valve

In a time before Justin Bieber, Y2K, and even Google, the year is 1998 and GFB’s founding engineer John Adrian is so sick of his new WRX stalling with an atmosphere-venting BOV he decided he...

Go Fast Bits Subaru WRX/STi 99-00, B4 Legacy, GT/XT Forester 98-04 Mach 2 TMS Blow-Off Valve

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below). Recirculation...

Go Fast Bits Subaru WRX/STi 99-00, B4 Legacy, GT/XT Forester 98-04 Respons TMS Blow-Off Valve

On the surface, it may look like just another dual-port blow-off valve, but the Respons is actually much more than that. Featuring GFB’s patented venting bias adjustment system, the Respons...

Go Fast Bits Subaru WRX/STi 99-00, Forester GT 01-02 LightweightEngine Pulley

GFB lightweight pulley kits are made from aircraft-grade 6061-T6 aluminium and offer faster acceleration through significant weight reduction on the crankshaft. Most of our kits are underdriven,...

Go Fast Bits Subaru WRXY01-07, STi 02+, XT Forester 05-08 Atmospheric Blow-Off Valve

Now you can control the sound of the BOV from inside the cabin! So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even...

Go Fast Bits SV52 Universal - High Flow/High Pressure Racing Dump Valve (Alloy Weld On)

Standing only 86mm tall (including the weld-on adaptor), the SV52 is 10mm shorter than the nearest competitor, AND flows more! Consider these questions when you’re looking for a BOV for your...

Go Fast Bits Universal 1/8" BSPT Hose Tail

Go Fast Bits Universal 20mm Inlet, 20mm Outlet Deceptor Pro II Remote Adjustable Blow-Off Valve

Now you can control the sound of the BOV from inside the cabin! So how much more can you do with a blow-off valve? Well, the Deceptor Pro II takes the ‘Respons’ concept even...

Go Fast Bits Universal 20mm Inlet, 20mm Outlet Hybrid Dual Outlet Blow-Off Valve

In a time before Justin Bieber, Y2K, and even Google, the year is 1998 and GFB’s founding engineer John Adrian is so sick of his new WRX stalling with an atmosphere-venting BOV he decided...

Go Fast Bits Universal 20mm Inlet, 20mm Outlet Mach 2 TMS Blow-Off Valve

Using GFB’s TMS technology the Mach 2 can help return the engine to peak boost up to 30% faster than a factory diverter valve when shifting gears (more information below). Recirculation...

Go Fast Bits Universal 20mm Inlet, 20mm Outlet Respons TMS Blow-Off Valve

On the surface, it may look like just another dual-port blow-off valve, but the Respons is actually much more than that. Featuring GFB’s patented venting bias adjustment system, the Respons...

Go Fast Bits Universal 25mm Bosch Replacement DV Diverter Valve

By retaining the factory ECU control and recirculating the vented air, the DV+ is a purely performance-oriented product that offers the following benefits: Sharper throttle response Faster...