
On Most Orders Over $250*
On Most Orders Over $250*
DETAILS
The IAG Air / Oil Separator (AOS) is a smart upgrade for your Subaru. Developed over years of rigorous testing on various standard and competitive applications, the IAG AOS provides unmatched protection for your 2015-2021 WRX and 2014-2018 Forester XT 2.0L FA 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. The IAG AOS works with all fuel types, enhances crankcase ventilation, and seamlessly integrates with standard ECU settings.
Oil in the engine's intake tract may lead to various negative effects. Preventing oil from entering the engine intake is vital to prevent premature mechanical issues and to uphold optimal performance in your Subaru. Oil coated components in the intake, intercooler and plumbing can lead to the breakdown of the rubber and silicone hose connections. Once the oil enters the intake tract, the oil can access the intake manifold and then the engine’s combustion chamber, potentially triggering detonation, pre-ignition, excessive emissions, smoke, power loss, reduced fuel efficiency, and even engine damage or complete engine failure.
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. The OEM PCV function is retained, so you still get the benefit of intake manifold vacuum helping to draw gasses through the system.
The IAG Air / Oil Separator integrates with the OEM PCV system, while increasing its capacity. In ethanol-fueled applications, it prevents oil dilution and lubrication issues by capturing fuel vapors from the oil and reintroducing them for combustion. IAG's AOS prevents oil from entering the intake and fuel dilution of the engine's lubrication system.
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.
The IAG Air / Oil Separator features a proprietary heating system that capably handles issues frequently encountered in lower-quality catch cans. Unlike inferior designs that allow hot PCV gasses to pass through cold passages, leading to condensation mixing with oil and causing sludge, IAG's improved design is linked to the vehicle's cooling system. This enables the transfer of heat from the engine into the AOS canister. By heating the AOS canister to the engine's temperature, condensation and associated buildup are significantly diminished or completely eliminated.
IAG's Air / Oil Separator comes with a complete set of custom-length SAE Quick Connection lines, simplifying the installation process and minimizing the risk of leakage as a result of a more dependable and secure connection compared to standard hose clamps. Once installed, our AOS system features a polished factory-like appearance that matches your Subaru’s engine.
Features:
Installation Instructions:
The IAG website has updated instructions and a very good video of installation of this AOS. That said, unless you’re familiar with the removal and installation of all the components (charge pipe, blow off valve, intercooler) expect it to take a while to get this installed (the video makes it look easy). Overall, worthwhile mod. My engine seems to run smoother than before.
Hi Jay, Thank you for sharing your experience!
AG’s updated install guide is definitely a great resource. Glad to hear your engine is running smoother after the install! We appreciate your 5 Star Review!
Regards,
Honestly Ngl, the install took me two days. Not easy when you have a FMIC, CAI, Front strut bar, aftermarket pitch mount, turbo inlet, and misc engine dress up. Directions are designed for a somewhat factory vehicle so there was a lot of head scratching and a lot of having to move things around and test fit and that repeated over and over. All an all, thing looks wicked, and somehow solved a slight unknown boost leak (hard pvc line to turbo inlet I think was the culprit). Ultimately, this is a must wether your vehicle is stock or modified, would recommend.
Hi there Kimo,
Thanks for taking the time to leave a 5 Star Review for the IAG Performance V3 Street Series Air / Oil Separator (AOS). We're happy to hear that you ultimately had a positive experience with the product and that it helped solve a boost leak issue. We understand that installation can be tricky, especially with a modified vehicle, but we're glad to hear that the end result looks great. Thanks for recommending the IAG AOS as a must-have for all vehicles. Happy driving!
Regards,
The 15+ WRX is not known for its reliability, but this mod allows me to rest assured that carbon build-up won't get any worse, if your PVC valve is getting old, this mod will also improve engine performance.
Owen,
Thank you for your 5 Star Review! We are glad to hear that the IAG Performance V3 Street Series Air / Oil Separator has given you peace of mind for your 2015-2021 WRX. We understand the concerns about reliability and carbon build-up, and we agree this AOS provides a perfect solution that can also improve engine performance. Thank you for choosing Subimods!
Regards,
The IAG AOS did not disappoint, from the quality parts and hardware to the functionality and ease of install. Thanks Subimods!
Eric,
Thank you for your positive feedback on the IAG Performance AOS! We're glad to hear that the product quality and ease of installation met your expectations! Our team at Subimods is always striving to provide quality products. Thank you for your continued support!
Regards,
IAG air oil separator is a must for any FA20DIT motor. Keep oil out of your ventilation system to protect your engine and prevent engine damage. Moderate ease of install. All parts and hardware fit perfectly.
Eric,
Thank you for your 5 Star Review of the IAG Performance V3 Street Series Air/Oil Separator. It is excellent to hear that the separator effectively prevents oil from entering the ventilation system, providing engine protection for the FA20DIT motor. The ease of installation and precise fit of all parts and hardware certainly contribute to its effectiveness. Enjoy your added protection!
Regards,