Using The In-Car Head Unit; Installing The Blow-Off Valve - GFB Deceptor Pro II Quick Start Manual

Using the In-Car Head Unit

When powered up the dial backlight will glow bright red, and will then automatically dim 10 seconds later to reduce
unnecessary glare, and will also reduce power to the motor – this is the "sleep" mode. To wake the unit up, simply
press the dial briefly before making adjustments.
The position of the dial is directly proportional the venting bias - turning the dial fully anti-clockwise sets the valve to
100% recirc, fully clockwise results in 100% atmosphere venting, and any ratio is possible between these limits.
The head unit also has a range limiting feature. This can be used to limit the maximum atmosphere-venting bias of the
Deceptor Pro II. For example, if you prefer that the maximum atmosphere venting bias is 60%, you can program the
controller so that full travel on the dial gives you only 60% movement at the valve. This is particularly useful on cars
that, through experimentation, find that full atmosphere venting does not agree with them.
To use this feature, set the dial in a position that you want as your maximum atmosphere-venting limit, then press and
hold the dial until the lights flash. The unit will record this new position as the maximum atmosphere-venting limit.
Now when you turn the dial fully clockwise, the Deceptor Pro II will only open as far as the point which you have just
set. For example, if you pushed the button with the dial set in the middle (50% atmosphere venting), full travel of the
dial will now move the valve from full recirc to 50% atmosphere-venting only.
Every time the button is pushed, the position of the dial will determine the maximum venting bias of your Deceptor
Pro. So to re-set the range to maximum again, simply turn the dial fully clockwise, then press and hold the dial.

Installing the blow-off valve

Covered vehicles:
 WRX/STi MY99-00
 Forester GT MY98-02
 Forester XT MY03-04
The Deceptor Pro II (part # T9500) is designed to be a direct factory replacement, and installation is as
simple as removing the factory valve and replacing with the Deceptor Pro II as follows:
1) Loosen the hose clamps from the recirc and vacuum hoses on the existing factory bypass valve,
then pull the hoses free.
2) Using a 12mm socket, remove the two bolts holding the factory bypass valve to the intercooler,
and remove the valve entirely.
3) Making sure the factory gasket is still in place, re-install the two bolts and screw them in about 3
turns each. The Deceptor Pro II can now be installed by inserting the lower slot on the flange onto
the lower bolt, then rotate the valve so the upper slot fits onto the upper bolt.
4) Tighten both bolts, then fit the recirc and vacuum hoses onto the Deceptor Pro II and replace the
hose clamps.
5) Connect the servo motor plug to the wiring loom from the controller, and make sure the cable is
securely routed through the engine bay away from exhaust or turbo parts.