Engines and Components› Oiling Systems

IAG Performance

1L Cast Aluminum Swirl Pot Air Oil Separator

$499.99

SKU: IAG-ENG-7187BK

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Special Order
Ships in 4–6 weeks
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$100 Minimum Order
30 Days Return
INSTALL DIFFICULTY
DIY PRO SHOP

Moderate — 2–4 hours

Overview

It features a 1-liter capacity swirl pot canister and an aluminum housing with a unique baffling system to control crankcase pressure. This AOS works with all fuel types and integrates with standard ECU settings.

This system operates without the need for routine draining. Separated oil collects on the canister walls and gradually drains back into the engine's crankcase. An integrated heating system prevents sludge buildup.
Show original supplier description
The IAG Air/Oil Separator (AOS) is engineered as a protective upgrade for your Subaru's engine. Designed through extensive testing, this AOS is specifically for the 2015-2021 WRX and 2014-2018 Forester XT models with the 2.0L FA engine. This system utilizes a 1-liter cast aluminum swirl pot canister to significantly improve the separation of oil from PCV system gases before they are returned to the intake. The durable, lightweight aluminum housing incorporates an intelligent baffle design for enhanced ventilation. The AOS works with all fuel types, improves crankcase ventilation, and integrates seamlessly with standard ECU settings without requiring tuning. To prevent oil from entering the intake tract, the IAG AOS uses a unique baffle system. Internal gas vortexes filter through baffles, trapping oil and allowing clean gas to escape. The system retains OEM PCV function, leveraging intake manifold vacuum. For ethanol-fueled applications, it captures fuel vapors from the oil to prevent dilution. The AOS also features a proprietary heating system, linked to the vehicle's cooling system, to minimize condensation and sludge buildup. Installation is simplified with custom-length SAE Quick Connection lines and pre-cut hoses on applicable Subaru models. The AOS is available in black, red, or neon yellow. This kit includes the Air/Oil Separator, a Hose And Fitting Kit, and a Mounting Bracket.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandIAG Performance
Part NumberIAG-ENG-7187BK
CategoryAir and Fuel
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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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