Go Fast Bits Subaru WRX/ Forrester 2015 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 03-07, Forester XT 03-08 3-Piece Underdrive Pulley Kit

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 WRX/STi 08-14, Liberty GT 03-12, Forester XT 09-12 Lightweight Engine Pulley

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

Go Fast Bits Subaru WRX/STi 94-07, Forester 98-07, Legacy 03-07 Lightweight Engine 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 WRX/STi 94-98, Forester GT 98-00 3-Piece Underdrive Pulley Kit

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 WRX/STi 97-98 35mm Inlet, 30mm 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 Subaru WRX/STi 99-00, B4 Legacy, GT/XT Forester 98-04 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...

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...