GFB Respons (part T9003) - Manual (Page 2)

7)
On the factory valve, remove the recirc elbow by
unscrewing the two Phillips-head screws holding it
on. Fit the recirc elbow to the outlet of the Respons
(figure 3) using the factory screws and o-ring.
8)
At this point you must unscrew the trumpet from the
Respons to allow the mounting bolt to be inserted
into the flange hole (figure 3).
9)
If the factory gasket is stuck to the intercooler at this
point, it should be removed. Scraping may be
required to remove all gasket material if it does not
come off cleanly. Take care not to drop any gasket
material into the intercooler.
10)
Push the elbow into the recirc hose in the
same way as the factory valve, and replace
the hose clamp (figure 4).
11) Bolt the valve onto the intercooler using
the supplied stainless steel bolts and
replace the intercooler.
12)
Push the vacuum hose onto the nipple on
the top of the valve. Screw the trumpet
back in place and do a final check to make
sure all bolts and clamps are tight.
Adjusting the Noise
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 (figure 5)
clockwise will open up the trumpet outlet more,
making the valve louder, whilst anti-clockwise
will open up more of the recirc outlet for quiet
operation.
Turning the adjustment fully anti-clockwise will
close off the trumpet completely, and the valve will operate like a factory bypass. Conversely,
turning it fully clockwise will make it vent 100% to atmosphere, which is the loudest setting.
Typically, most Subaru engines will allow 100% atmosphere venting with no problems provided the
spring pre-load is set correctly (see below). However, some combinations of engine modifications
may result in backfiring when the valve vents to atmosphere, in which case the solution is simply to
dial back the amount of air vented to atmosphere until the problem is resolved – this is one of the
key benefits of the venting bias adjustment feature.
Do not be afraid to experiment with the spring and noise settings, no harm will come to the engine
if wrong setting is used.