GFB 5925 Mach 2 Atmosphere Conversion Kit suit GFB# T9107/T9125

To vent the Mach 2 to atmosphere, you need to ensure the piston stays closed at idle, and the recirc hose is plugged. The 5925 Atmosphere Conversion Kit includes a 25mm hose plug to block off the recirc hose, a trumpet to replace the hose outlet on the Mach 2 (not necessary for functionality, but makes the sound louder!), and a firmer spring (part # 6115).

The Mach 2 is supplied with a softer spring (part # 6116) that is suitable for recirculation venting or cars with idle vacuum of 18inHg or less. If the piston stays closed with the existing spring in the Mach 2, there is no need to swap it out. However, if the piston hovers open at idle even with the spring pre-load maxed, the firmer spring in this kit should be installed to prevent stalling or backfiring.

Suits the following applications:

• VW Passat B5-B5.5 1.8t 96-05 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI B5 (1995-2001) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI B5 (1995-2001) 1.8t/VW Golf GTI Mk4 1.8t 97-05 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI TT 8N 1.8t 98-06 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI TT 8N 1.8t 98-06 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI TT 8N 1.8t 98-06 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• VW Polo GTI Mk4F (Typ 9N3) 1.8t 05-09 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI S3 8L (1999-2003) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• FORD AUSTRALIA XR6 FG 4.0L turbo 08-on
  AUDI B5 (1995-2001) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI B5 (1995-2001) 1.8t VW New Beetle 1st Generation 1.8t 99-on Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI B6 (2001-2005) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI S3 8L (1999-2003) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI B6 (2001-2005) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• AUDI TT 8N 1.8t 98-06 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• FORD AUSTRALIA XR6 BA-BF 4.0L turbo 02-08
• FORD AUSTRALIA XR6 BA-BF 4.0L turbo 02-08
• MAZDA SP Turbo 2002 (150kW/200hp)
• AUDI 8L (1996-2003) 1.8t Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• FORD AUSTRALIA Territory SY 4.0L turbo 06-11 Note : When installing a GFB valve, it must be installed in the OPPOSITE orientation to the factory plastic Bosch valve - i.e. air must enter the GFB valve at the bottom, and dump through the sides.
• SUBARU XT MY14-on (FA20 engine)
• AUDI TT 8N 1.8t 98-06