Go Fast Bits TMS Respons Hybrid Blow Off Valve for WRX STI Subimods.com Go Fast Bits TMS Respons Hybrid Blow Off Valve for WRX STI Subimods.com GFB Mach 2 Blow Off Valve for 02 07 WRX 04+STi (T9103) GFB Respons Blow Off Valve for 1G DSM Skyline (T9002) GFB Go Fast Bits Respons TMS Blow Off Valve BOV Kit For 15 17 WRX. 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 100 psi plus. Put simply, it can hold more boost than any turbo could produce. This Part Fits: Year Make Model Submodel 2004 2005 Subaru Forester XT 1999 2000 Subaru Impreza L 1999 2000 Subaru Impreza Outback 1999 2000 Subaru Impreza RS 1998 2000 Subaru Legacy Brighton 1998 2002 Subaru Legacy GT 1998,2000 2002 Subaru Legacy GT Limited 1998 2002 Subaru Legacy L 1999 Subaru Legacy L 30th Anniversary 1999 Subaru Legacy Limited 30th Anniversary 1998 1999 Subaru Legacy Outback 1999 Subaru Legacy Outback Limited 1998 Subaru Legacy Postal 1999 Subaru Legacy SUS 30th Anniversary