1)
On cars where there is a plastic
engine/intercooler cover, begin by removing
this to gain access to the valve.
2)
Using a 10mm socket, remove the two
bolts holding the factory bypass valve to the
intercooler ( ), then remove the vacuum
hose and recirc hose.
3)
Take the valve off the car and set aside.
4)
Fit the GFB valve to the intercooler,
making sure the supplied red o-ring is fully
inserted into the groove in the underside of
the GFB valve as shown below.
5)
Replace the two bolts, vacuum and
recirc hoses and clamps.
Respons installation
Covered vehicles: MY08-14 WRX, MY03-09 Legacy/Liberty GT, MY09-13 Forester XT
Supplied o-ring
Venting bias
adjuster
Adjusting the sound
The unique patented venting bias
adjustment feature on the GFB Respons lets
you vary the amount of air vented to
atmosphere or recirc, thereby changing the
volume of the sound.
Turning the venting bias adjuster anti-
clockwise will open up the trumpet outlet
more, making the valve louder, whilst
clockwise will open up more of the recirc
outlet for quiet operation. Turning the valve
fully clockwise until it stops will close off the
trumpet completely, and the valve will
operate like a factory bypass valve.
Conversely, turning it fully anti-clockwise will
make it vent completely to atmosphere,
which is the loudest setting.