GFB 99-00 WRX/STI TMS Respons Blow Off Valve Kit

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 WRX/STi MY99-00, B4 Legacy, GT/XT Forester MY98-04 Fitment: Subaru Forester XT 2004 Subaru Forester XT 2005 Subaru Impreza L 1999 Subaru Impreza L 2000 Subaru Impreza Outback 1999 Subaru Impreza Outback 2000 Subaru Impreza RS 1999 Subaru Im