Go Fast Bits Respons Bypass Valve WRX (2002-2007) STI (2004-2018) Porsche - Interchangeable springs for a

- Interchangeable springs for a great range of boost levels

allowing your radiator fan to activate at 80°C / 176°F degrees

The Hyper Radiator Cap withstands an open valve pressure rating of 1

The specs for this winning blue Gram Lights 57Xtreme Wheel

Go Fast Bits Respons Bypass Valve WRX (2002-2007) STI (2004-2018) Porsche - Interchangeable springs for aThe Go Fast Bits Respons blow off bypass valve system for WRX STI Forester is much more than simply a noise maker or a factory valve replacement. The Go Fast Bits Respons valve features the GFB Turbo Management System (TMS), designed specifically for the purpose of turbo lag reduction. Go Fast Bits in house testing facilities have measured a return to peak boost up to 30% faster between shifts than most factory systems, giving you quicker on off boost