IAG AOS Air / Oil Separator | 2015-2021 Subaru WRX (IAG-ENG-7187)

2015-2021 WRX Air/Oil Separator by IAG Performance

The IAG Air/Oil Separator (AOS) is a smart investment to safeguard and improve your Subaru’s performance. Developed over years of rigorous testing on various standard and competitive applications, the IAG AOS provides unmatched protection for your 2015-2021 Impreza WRX engine. Our exclusive AOS design incorporates a 1-liter cast aluminum swirl pot canister that significantly improves oil separation from the PCV system before returning PCV gasses to the intake. The durable and lightweight aluminum housing provides improved ventilation, while incorporating the use of an intelligent baffle design that sets it apart from the competition. It works with all fuel types, prolongs engine lifespan, enhances crankcase ventilation, and seamlessly integrates with standard ECU settings.

Unlike ordinary catch-can systems, the IAG Air/Oil Separator functions without the need for routine draining or maintenance. The separated oil gathers along the walls of the AOS canister, then drains gradually into the engine’s crankcase. The large body of the IAG AOS eliminates the risk of overflow by allowing the oil to drain slowly, whereas smaller catch cans are unable to keep up and often require manual draining. The exclusive heating system on the IAG AOS ensures that the gathered oil remains free of sludge, reducing the possibility of reintroducing it back into the engine.

The IAG Air Oil Separator uses a unique baffle system to collect and drain the oil from your engine’s PCV gasses back to the crankcase. The AOS body’s inlet hoses create an internal gas vortex, which then filters through the baffles, trapping the oil and allowing the gas to escape from the top of the AOS canister. Because the OEM PCV remains functional, the engine is also able to provide additional vacuum, which helps to remove more of the PCV gasses.

The IAG Air Oil Separator works alongside the OEM PCV system, while increasing its capacity. It assists the PCV gasses to the turbo inlet using a new, upgraded metal PCV check valve that provides extra suction and air-oil separation. In ethanol-fueled applications, it prevents oil dilution and lubrication issues by capturing fuel vapors from the oil and reintroducing them for combustion. IAGs AOS prevents oil from entering the intake and oil dilution in the engine’s lubrication system, going beyond the capabilities of the OEM PCV system alone.

Crafted with a lightweight yet sturdy aluminum housing, the IAG Air Oil Separator is even lighter than our previous AOS iterations. Whether you’re drag racing or hitting the track in your Subaru, we value the importance of weight savings. This is why we’ve fine-tuned and lightened this AOS design to enhance your Subaru’s overall performance, guaranteeing you get the best results every time you race or hit the track.

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

Please Note: The IAG AOS is not compatible with most aftermarket strut tower bars.

Applications

• 2015 – 2021 Subaru WRX
• This product is not compatible with most aftermarket strut tower bars

What’s In The Box?

• 1 – IAG Air/Oil Separator
• Hardware, Lines & Fittings Included

References

• PDF Instructions for 15-16 WRX
• PDF Instructions for 17-21 WRX

Warranty

• Manufacturer Standard Warranty