Cobb Tuning 04-19 STI / 06-14 WRX AOS

FEATURES of the Cobb Air/Oil Separator WRX 2006-2014, STI 2004-2019:

Billet Aluminum Tank Design
Bespoke COBB Anodizing on Caps
Wrinkle Black Powder Coated Canister
Laser Etched COBB Logo
Developed in Partnership with IAG Performance

WHY DO YOU NEED THIS?

The COBB Subaru Air/Oil Separator helps to prevent crankcase oil vapors from recirculating back through your engine's intake system.

Oil vapors passing through your engine's intake system lower the effective octane rating of fuel and can contribute to both oil and carbon buildup over time.

The more boost pressure you are running, and the more modified your car is, the more you will benefit from an Air Oil Separator!

Cobb Part Number:

06-07 WRX and 04-07 STI - 811600

08-14 WRX and 08-19 STI - 822600  

SKU
GDGR-COBB-AOS

COBB Tuning is an automotive engineering company founded in Rockwall TX by Trey COBB in 1999. We are dedicated to developing solutions that improve vehicle performance and the driving experience. COBB Tuning approaches design by taking the entire vehicle-platform into account as a complete system. Our ultra-high-quality products and services are professionally engineered, thoroughly tested and backed by industry leading customer service to ensure that they meet our objectives and exceed customer expectations.From our initial Subaru focus, COBB Tuning has expanded its product offerings to BMW, Ford, Mazda, Porsche , Mitsubishi, Nissan and Volkswagen specializing in engine management electronics, intake tract components, turbocharged exhaust systems, turbo kits, drivetrain components and suspension components. We are a one-stop firm with an enviable set of qualified skills and the exceptional ability to design, engineer, manufacture, test and service our own products under one roof. Whether it’s our state-of-the-art Accessport ECU programmer, our exceptional bolt-on performance products, COBB Tuning has the experience, skill and attitude to meet your specific needs.

Grouped product items
Product Name Qty
811600 - 04-07 STI, 06-07 WRX Air Oil Separator
$450.00
822600 - 08-19 STI and 08-14 WRX Air Oil Separator
$450.00

The COBB Air/Oil Separator is placed within your Subarus crankcase ventilation system and helps to prevent oil vapors from being introduced into the intake system. The COBB Air Oil Separator has been developed in partnership with IAG Performance and offers exclusive features.

Heat Shielding on Crankcase Breather and Oil Return Lines
Coolant Bleeder Valve
Bespoke COBB Color Combination
Laser Etched COBB Logo


The Subaru EJ engine has 3 ports that vent crank pressure: one on each cylinder head and another on the top of the block. Each engine vent port receives its own connection to the AOS. By giving each engine port its own entrance to the AOS we have allowed for more effective and faster excavation of crankcase pressure. Additionally, this reduces overall system pressure. With a 4" OD and 5.75" height, the AOS has an approximate 1 liter of holding capacity. The larger the AOS, the more power you can safely make without having to worry about the AOS overfilling.

The bottom of the AOS is shaped like a snail, redirecting positive crank pressure into the same swirl pattern produced by the 3 side ports. Allowing maximum oil drainage while separating oil from the air in all the venting ports.

The back plate of the AOS features a unique coolant routing system that heats the entire AOS to the same temperature of the engine. This maximizes the evaporation of any water collecting inside of the can. The hotter the AOS, the less water will collect inside and mix with the oil.



warning_symbolWARNING: Operating, servicing and maintaining a passenger vehicle or off-road vehicle can expose you to chemicals including engine exhaust, carbon monoxide, phthalates, and lead, which are known to the State of California to cause cancer and birth defects or other reproductive harm. To minimize exposure, avoid breathing exhaust, do not idle the engine except as necessary, service your vehicle in a well-ventilated area and wear gloves or wash your hands frequently when servicing your vehicle. For more information go to https://www.P65Warnings.ca.gov/passenger-vehicle.

More Information
SKU GDGR-COBB-AOS
Product Type Engine
Engine Oiling System
Brand COBB
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