Go Fast Bits performance parts that fit TT Typ 8N 1.8t 98-06
All 8N9 132kw Petrol Engine FWD Convertible 10/99-06/06 models

MACH 2 ATMOSPHERE UPGRADE KIT (SUITS T9107 & T9125)
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.
Turbofuse
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 side.
Respons TMS T9025 adjustable bias venting diverter valve- BOV
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.
Mach 2 T9125(25mm diverter valve) with option for atmosphere configuration
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.
dv+ T9301(25mm Bosch diverter valve replacement)- BOV
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.
Deceptor pro II- inside car adjustable adjustable bias venting diverter valve
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.