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Old 08-15-2011, 04:25 PM   #1
Edo Performance
Former Vendor
Member#: 70537
Join Date: Sep 2004
Chapter/Region: SCIC
Location: Huntington Beach, CA
OMGHi2U HOW TO: Tomioka Racing Air Oil Separator Install!!

The air and oil separator is a must have unit for all Subaru engines! Constructed from high-quality aluminum, this handy unit will help you lower emission, keep the intake charge pipe clean, reduce the oil burned in the engine and reduce the detonation due to a dirty intake charge pipe. Tomioka Racing AOS is compatible with factory PCV system and it drains oil into the factory oil pan automatically.


PN: AO1000

(1) Air Oil Separator
(1) 8 ft. Oil Resistant Hose
(10) 6 in. Black Zip Ties
(2) in. Hose Fittings
(1) in. Adapter
(1) in. Rubber Cap
(2) 5/8 in. to in. Adaptor

Impreza WRX / STi 1993-2011
Forester 1998-2011
Legacy 1990-2011


2002-2007 WRX & 2004-2011 STI with Stock Top Mount Intercooler

Step 1: Remove the oil filler cap and loosely install the Tomioka Racing (TR) Air oil separator (AOS) on to the oil filler tube.

Step 2: Locate and remove the rear crank case breather hose running from the turbo inlet hose to the crank case vent

Step 3: Remove the hose leaving the exposed nipples.

Step 4: Cap the open nipple on the turbo inlet hose with supplied cap and secure with supplied zip tie.

Step 5: Take the hose you removed and cut off the bottom 4 inches where it connected to the nipple. Install the supplied 5/8 to 1/2" adapter as shown below.

Step 6: Reinstall on unplugged nipple as shown here (use a little lubricant to make this easier). The secure the hose to the nipple with supplied zip ties.

Step 7: Locate the hose running from the intercooler tube to the turbo inlet hose. Remove the hose completely.

Step 8: Remove the factory hose
Step 9: Install the supplied 1/2" hose as shown below.

Step 10: Cut the hose to length of approximately 4 inches

Last edited by Edo Performance; 08-16-2011 at 03:00 AM.
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