Air/Oil Separator by Cobb Tuning

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.

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.

Features

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

California Residents: Prop 65 Warning

Applications

• 2015 - 2020 Subaru WRX STI
• 2008 - 2014 Subaru Impreza WRX
• 2008 - 2014 Subaru Impreza WRX STi

What's In The Box?

• 1 - Cobb AOS
• Hoses & Hose Fittings
• Mounting Brackets & Hardware

References

• Installation Instructions

Warranty

• Manufacturer's Warranty