Why is this so important? Two key reasons:

1. Adjust how loud the blow-off sound is. Recirculate all of the air for silent factory operation, vent it all to atmosphere for maximum noise, or set it ANYWHERE in between to suit your preference.
2. Get a blow-off sound WITHOUT causing stalling, backfiring, or any other BOV-related issues, even on a car with a sensitive airflow meter (MAF).

Hold on, it gets better. The GFB Respons isn’t just a noise-maker. It also;

• Offers better throttle response
• Faster boost recovery on gearshift
• Unlimited boost-holding!

Vehicle Applications
Respons T9025 Diverter / Blow Off Valve with Sound Adjustment System for Audi, VW, Ford, Mazda Applications also suits:
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.
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 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 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 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 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.
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 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.
FORD AUSTRALIA XR6 BA-BF 4.0L turbo 02-08
FORD AUSTRALIA XR6 BA-BF 4.0L turbo 02-08
FORD AUSTRALIA XR6 FG 4.0L turbo 08-on
MAZDA SP Turbo 2002 (150kW/200hp)
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.
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.
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.
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 B5 (1995-2001) 1.8t
AUDI B5 (1995-2001) 1.8t
VW Bora MK4 1.8t 00-05
SAAB 9-3 Turbo 98-02
SAAB 9-3 Turbo 98-02
SAAB 9-3 Turbo 98-02
SAAB 9-3 Turbo 98-02
SAAB 9-3 Turbo 98-02
SAAB 9-3 Turbo 98-02
SAAB 9-5 Turbo 98-09
SAAB 9-5 Turbo 98-09
SAAB 9-5 Turbo 98-09
SAAB 9-5 Turbo 98-09
SAAB 9-5 Turbo 98-09
SAAB 9-5 Turbo 98-09
SAAB 9-5 Turbo 98-09
AUDI S4 B5 (Typ 8D) 2.7 Biturbo 97-01 (two valves required)
AUDI TT 8N 1.8t 98-06