IAG Performance | 1203 Baltimore Blvd. Westminster, MD 21157 | Ph: 410-840-3555 | www.iagperformance.com
IAG Competition Series Air / Oil Separator (AOS) For 2017 STI
Tools Required: Ratchet, torque wrench, extensions,
needle nose pliers, hose cutter, snips/scissors, flat head
screw driver, hose clamping pliers
Sockets: 10mm, 12mm, ¼” allen,
Wrenches: ⅞”, 8mm, 10mm, 19mm 3mm allen, 5mm allen,
pry bar,
Other: Electrical Tape
Congratulations on the purchase of your Air/Oil Separator
(AOS) and thank you for choosing IAG Performance. This
installation manual is intended to guide you through the
removal of the factory PCV system and the installation of
the IAG AOS. If you already have an aftermarket catch can
or AOS installed, please consult the specific instructions for
your hardware to aid in its removal.
Note: The 2015+ STI cars are equipped with a “noise
symposer” engine sound enhancing device that connects
the intake to the firewall. These instructions do not cover
the removal process of this device. Usually this device is
already bypassed by the time an AOS is required.
Top Coolant Hose Assembly
20” Hose Length, ½” I.D., -8ORB
Bottom Coolant Hose Assembly
20” Hose Length, ½” I.D., -8ORB
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Valve Cover Breather Hose
Block Drain Replacement Hose
Comp Series Upper Breather Fitting
Fasteners for Breather Top Fitting
Coolant Hose Spring Clamps
Mounting Bracket Hardware
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