If cars like yours typically suffer issues such as backfiring and stalling when using a fixed-ratio atmosphere-venting BOV, the Respons can help. By adjusting the venting bias to suit the car you can achieve a blow-off sound without having to put up with the issues. Like all GFB valves, the Respons utilises GFB's proven TMS Technology to ensure rapid boost recovery on gearshift and optimum throttle response, as well as the ability to withstand boost pressures of 100psi+. Put simply, it can hold more boost than any turbo could produce.
GFB's Respons, allowing you to infinitely vary how much air is recirculated or vented to atmosphere. Simply by twisting the adjustment ring, you can change the sound of your BOV from silent to ear-shattering!?.
Subaru 35mm inlet, 30mm outlet - suits MY97-98 WRX/Sti

Fitment:
1983 Mitsubishi Starion Base
1983 Mitsubishi Starion LS
1984 Mitsubishi Cordia Turbo
1984 Mitsubishi Starion ES
1984 Mitsubishi Starion LE
1984 Mitsubishi Starion LS
1985 Mitsubishi Cordia Turbo
1985 Mitsubishi Starion ES
1985 Mitsubishi Starion ESi
1985 Mitsubishi Starion LE
1985 Mitsubishi Starion LS
1986 Mazda 626 GT
1986 Mitsubishi Cordia Turbo
1986 Mitsubishi Starion ESi-R
1986 Mitsubishi Starion LE
1987 Chrysler Conquest Base
1987 Mazda 626 GT
1987 Mitsubishi Cordia Turbo
1987 Mitsubishi Starion ESi-R
1987 Mitsubishi Starion LE
1988 Chrysler Conquest TSi
1988 Mazda 626 Turbo
1988 Mazda 626 Turbo 4WS
1988 Mazda MX-6 GT
1988 Mitsubishi Cordia Turbo
1988 Mitsubishi Starion ESi
1988 Mitsubishi Starion ESi-R
1988 Toyota Celica All Trac
1989 Mazda 626 Turbo
1989 Mazda MX-6 GT
1989 Mazda MX-6 GT 4WS
1989 Mitsubishi Starion ESi-R
1989 Nissan 300ZX Turbo
1989 Toyota Celica All Trac
1990 Mazda 626 GT
1990 Mazda MX-6 GT
1990 Mazda MX-6 GT 4WS
1990 Nissan 300ZX Turbo
1990 Toyota Celica All Trac
1991 Mazda 626 GT
1991 Mazda MX-6 GT
1991 Nissan 300ZX Turbo
1991 Toyota Celica All Trac
1992 Mazda MX-6 GT
1992 Nissan 300ZX Turbo
1992 Toyota Celica All Trac
1993 Nissan 300ZX Turbo
1993 Toyota Celica GTS All Trac
1994 Nissan 300ZX Turbo
1995 Nissan 300ZX Turbo
1996 Nissan 300ZX Turbo
1997 Subaru Impreza Brighton
1997 Subaru Impreza L
1997 Subaru Impreza Outback
1998 Subaru Impreza L
1998 Subaru Impreza Outback
1998 Subaru Impreza RS