IAG Performance V3 Street Series Air / Oil Separator (AOS) Neon Yellow 2008-2014 WRX / 2008-2021 STI

The IAG Performance V3 Street Series Air / Oil separator (AOS) is an excellent investment to keep your Subaru vehicle running well. The Street Series AOS maintains OEM PCV system functionality, but supplements its capacity. The Street Series AOS design is based on years of extensive testing on standard and competition applications. The Street Series AOS' large, 1-liter, cast aluminum swirl pot canister more effectively separates oil from the PCV system upstream of PCV gasses return to the intake system. The Street Series AOS' fully-heated cast aluminum housing, superior venting, and unique, patent pending, baffle design set it apart from the rest. The Street Series AOS is compatible with all fuel types, extends engine life, improves crankcase ventilation and is compatible with standard ECU calibrations.

Keeping oil out of the engine intake tract is extremely important towards preventing premature mechanical failure and maintaining performance. Oil in the intake tract of the engine has several detrimental effects. First, the oil coats the internal portions of the intake, intercooler, and piping. This oil may cause premature failure of rubber or silicone hoses, which leads to failed connections. Once the oil reaches the intake tract it will directly enter the intake manifold and then the combustion chamber of the engine. Oil inside of the combustion chamber can cause detonation and preignition, high emissions, smoke, loss of power, decreased gas mileage, and even catastrophic engine failure leading to expensive repair bills.

The Street Series AOS maintains the OEM PCV system functionality, but supplements its capacity. The Street Series AOS PCV discharge gasses return to the turbo inlet, retaining a PCV valve to draw additional suction, improving air oil separation. The Street Series AOS protects from oil dilution and lubrication failures in ethanol fueled application because the Street Series AOS captures fuel vapors out of the oil and returns these vapors to the intake tract for combustion. The Street Series AOS protects from both oil entrainment in the intake flow and oil dilution in the engine's lubrication system far better than the OEM PCV system alone.

Features: 

• True 360 Degree Rotating Breather Port
• Dual Breather Ports
• Greater Pressure Stream Oil Separation
• Compact Cast Aluminum Design
• Approximate 1 Liter Holding Capacity
• Integrated ORB Ports
• Aluminum Body is powder coated in Red or Black Wrinkle Finish
• The side of the AOS features 3 -8 ORB removable billet hose barbs.
• Unique Baffling Controls Crankcase Pressure
• Returns Oil To The Engine
• No Maintenance or Manual Draining Required
• Includes all fitting required for installation
• Includes unique billet aluminum coolant swivel fittings

Installation Instructions: 

• 2008-2014 WRX Installation Instructions
• 2008-2014 STI Installation Instructions
• 2015-2021 STI Installation Instructions
• 2005-2009 Legacy GT Installation Instructions