GFB T9225 HYBRID DUAL OUTLET VALVE - Audi TT MK1 1.8T B9 A4 Disc friendly compound that helps

Disc friendly compound that helps minimise rotor wear compared with aggressive race mixes

5 inch single centre

Ideal for owners searching for BMW F10 525d front rotors

intake and exhaust cam control valve

GFB T9225 HYBRID DUAL OUTLET VALVE - Audi TT MK1 1.8T B9 A4 Disc friendly compound that helpsAll the Performance with the Noise! The Hybrid valve is back! In 1999, GFBs first Hybrid valve pioneered the dual port design, which was so successful the technology has since been adopted by most other brands. By staging the two venting outlets, at low valve lifts most of the air is recirculated. As the car is driven harder, the valve opens further and more of the atmosphere venting port is exposed for a louder sound. As a benefit, this system makes