GFB's Mach 2 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. With its single venting outlet, the Mach 2 is configured from the factory for full recirculation (i.e. plumb back, diverter, bypass) venting for the performance-minded who just want the benefits without the sound.This Part Fits:YearMakeModelSubmodel2004-2005SubaruForesterXT1999-2000SubaruImprezaL1999-2000SubaruImprezaOutback1999-2000SubaruImprezaRS1998-2000SubaruLegacyBrighton1998-2002SubaruLegacyGT1998,2000-2002SubaruLegacyGT Limited1998-2002SubaruLegacyL1999SubaruLegacyL 30th Anniversary1999SubaruLegacyLimited 30th Anniversary1998-1999SubaruLegacyOutback1999SubaruLegacyOutback Limited1998SubaruLegacyPostal1999SubaruLegacySUS 30th Anniversary.