ALL THE PERFORMANCE WITH OR WITHOUT THE NOISE!, 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 100psi+. Put simply, it can hold more boost than any turbo could produce
GFB's Mach 2 diverter valve 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. Atmosphere venting kits also available.
Subaru WRX/STi MY99-00, B4 Legacy, GT/XT Forester MY98-04

Fitment:
1998 Subaru Legacy Brighton
1998 Subaru Legacy GT
1998 Subaru Legacy GT Limited
1998 Subaru Legacy L
1998 Subaru Legacy Outback
1998 Subaru Legacy Postal
1999 Subaru Impreza L
1999 Subaru Impreza Outback
1999 Subaru Impreza RS
1999 Subaru Legacy Brighton
1999 Subaru Legacy GT
1999 Subaru Legacy L
1999 Subaru Legacy L 30th Anniversary
1999 Subaru Legacy Limited 30th Anniversary
1999 Subaru Legacy Outback
1999 Subaru Legacy Outback Limited
1999 Subaru Legacy SUS 30th Anniversary
2000 Subaru Impreza L
2000 Subaru Impreza Outback
2000 Subaru Impreza RS
2000 Subaru Legacy Brighton
2000 Subaru Legacy GT
2000 Subaru Legacy GT Limited
2000 Subaru Legacy L
2001 Subaru Legacy GT
2001 Subaru Legacy GT Limited
2001 Subaru Legacy L
2002 Subaru Legacy GT
2002 Subaru Legacy GT Limited
2002 Subaru Legacy L
2004 Subaru Forester XT
2005 Subaru Forester XT