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IAG Air / Oil Separator (AOS) Fits 2006-07 Subaru Impreza WRX & 2004-07 STI

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IAG Performance

IAG Air / Oil Separator (AOS) Fits 2006-07 Subaru Impreza WRX & 2004-07 STI


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IAG Air / Oil Separator (AOS) Fits 2006-07 Subaru Impreza WRX & 2004-07 STI

IAG Air / Oil Separator (AOS) Fits 2006-07 Subaru Impreza WRX & 2004-07 STI


IAG Air / Oil Separator (AOS) Fits 2006-07 Subaru Impreza WRX & 2004-07 STI

  • IAG Performance Air / Oil Separator (AOS) Street to Competition Series Conversion Kit For 06-14 WRX, 04-21 STI
  • IAG Multi-Directional Hose Clamp Pliers


IAG Air/ Oil Separator (AOS) fits 2006-07 SUBARU WRX & 2004-07 STI


The IAG Air / Oil Separator (AOS) is a worthwhile investment to safeguard and enhance the performance of your Subaru. Developed through years of testing on standard and competitive applications, the IAG Air / Oil Separator offers unparalleled protection for your 2006-2007 Impreza WRX or 2004-2007 STI engine. Our 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. Constructed from a lightweight, yet durable aluminum housing, the IAG AOS offers improved ventilation and incorporates an intelligent baffle design that sets it apart from the competition. It is compatible with all fuel types, extends engine life, improves crankcase ventilation, and seamlessly integrates with standard ECU settings.


Oil entering the engine's intake tract can result in a range of adverse effects. Preventing oil from entering the engine intake is crucial to prevent premature mechanical problems and to maintain optimal performance in your Subaru. The oil can coat the internal components of the intake, intercooler and plumbing, which can lead to the deterioration of the rubber and silicone hoses, eventually compromising the connections. Once inside 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.

AOS Prevents Oil From Entering The Intake


The IAG Air / Oil Separator was designed for ease of use and unlike ordinary catch-can systems, our Air / Oil Separators work without the need for routine draining or maintenance. The separated oil collects along the walls of the AOS can, then drains gradually into the engine's crankcase. The oversized AOS body allows the oil to drain slowly, eliminating the risk of overflow often seen in smaller catch cans. Our exclusive heating system 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.

IAG Air/ Oil Separator (AOS) fits WRX & STI
IAG AOS Lightweight Design


The IAG Air / Oil Separator is constructed from a lightweight, yet durable aluminum housing that is even lighter than any of our previous versions. Whether you drag race or take your Subaru to the track, we know that every little bit of weight counts. This AOS design has been lightened and refined to maximize the overall performance of your Subaru, ensuring you get the most out of every race or track day.


The IAG Air / Oil Separator incorporates the use of its exclusive heating system to eliminate problems found in lesser quality catch cans. Poorly designed versions allow hot PCV gasses to pass through the cold passageway, allowing for condensation to mix with the oil and cause sludge. IAG’s upgraded design attaches to the vehicle’s cooling system, allowing heat from the engine to transfer 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 AOS SAE Quick Connection Lines


IAG’s Air / Oil Separator includes a full set of custom length SAE Quick Connection lines that simplify the installation of the AOS system, as well as reduce the chance of leakage because they offer a more reliable and secure connection than basic hose clamps. Once installed, our AOS system has a polished factory-like appearance that blends seamlessly with your Subaru’s engine.


Our engineers set out to make the system as easy to install as possible for the 2006-2007 Subaru Impreza WRX and 2004-2007 STI. The connection hoses at the canister are custom fitted SAE Quick Connection lines that are the exact length to reach the corresponding engine parts. The IAG Air / Oil Separator also includes pre-cut and crimped hoses on applicable Subaru models. The IAG AOS is available in your choice of black, red or neon yellow to perfectly accentuate the engine bay of your Subaru.

IAG Air/ Oil Separator Installed on 2006-07 SUBARU WRX & 2004-07 STI

What's Inside:

  • Product Name: IAG Air / Oil Separator (AOS) Fits 2006-07 Subaru Impreza WRX & 2004-07 STI
  • Part Number: IAG-ENG-7185
  • Material: Cast Aluminum
  • Color: Black, Red, Neon Yellow
  • Package Includes: 1x Air / Oil Separator, 1x Hose And Fitting Kit, 1x Mounting Bracket
  • Fitment: 2006-07 Subaru Impreza WRX & 2004-07 STI

Installation Instructions:

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Model Year & Fitment

  • 2002 Subaru WRX
  • 2003 Subaru WRX
  • 2004 Subaru WRX
  • 2005 Subaru WRX
  • 2006 Subaru WRX
  • 2007 Subaru WRX
  • 2004 Subaru STI
  • 2005 Subaru STI
  • 2006 Subaru STI
  • 2007 Subaru STI


FREE SHIPPING on orders of $250 or more* Simply look for the logo to enjoy free shipping on selected items throughout the store. Oversized packages and freight shipments do not qualify for free shipping. If the items in your order which qualify for 'Free Shipping' total $250 or more, your order ships FREE! Free shipping is only available to the continental United States also referred to as the “lower 48 states”.

Shipping Policy: All products sold on the shopping cart are shipped by UPS or USPS. All packages include shipping insurance in case they are lost or damaged. USPS requires signature confirmation on all insured orders over $200.00. USPS shipping times are estimated and not guaranteed. UPS tracking numbers are automatically generated when a package ships and the number is sent to the email address you provided. If a package contents is damaged during shipping please notify the shipping driver and file a claim with the shipper. You have 14 days to inspect your shipment and contents. After that period of time, IAG is no longer responsible for missing items. You have 30 days to report any damaged or incorrect items, after that period of time IAG is no longer responsible for returns or exchanges. You can contact us by Email or call 410-840-3555 for assistance. *International orders are subject to customs charges, duties or fees. Please check with your local customs office before ordering. IAG is not responsible for international customs charges, duties or brokerage fees.

Drop Shipping: Some items require drop shipping to complete an order. These products are shipped from manufacturer or distributor warehouses across the country. In some cases, this may speed up delivery time. In other cases, it could add 1-3 days to the delivery time. If you have a question regarding an order please contact our sales desk at 410-840-3555.

Order Processing: Orders placed after 3PM EST may not be processed the same day. Order processing may take 24-48 hours. USPS orders placed after 10am EST will ship the following business day if the items are in stock


How do I return an item?

You have 14 days to inspect your shipment and contents. After that period, IAG is no longer responsible for missing items. You have 30 days to report any damaged or incorrect items, after that period IAG is no longer responsible for returns or exchanges. All stocking products are subject to a 30 Day return policy. The item(s), when approved for return, are subject to a 20 percent restocking fee. Canceled orders may be subject to a 20 percent cancellation fee. All product returns require a return authorization number before being shipped back to IAG or the manufacturer. An “RMA” number is obtained by calling the IAG Support Desk at 410-840-3555 or emailing Some products may require shipping back to the manufacturer for inspection before a return or exchange may be processed. Some products may not be able to be returned. Products that have been modified or installed are not eligible for return. There are no returns or cancellations for Special Order/Made to Order items and Electrical Components (including the COBB Accessport). Items returned after the 30 Day return period without an RMA will be refused. Canceled service appointments with deposits are non-refundable.

Refunds take 30 days or less. Payments made by Credit Card or PayPal are returned back to the original account used during the transaction. There are no cash returns; we will issue a business check for the return of funds. Refunds are decided by the management and not by sales staff. Canceled service appointments with deposits are non-refundable.

IAG Performance Product Warranty (Excluding - Short Blocks / Long Blocks)

This limited warranty gives you specific legal rights and you may also have other rights, which vary from state to state. We limit the duration and remedies of all implied warranties, including, without limitation, the warranties of merchantability and fitness for a particular purpose to the duration of this express limited warranty. Some states do not allow limitations on how long an implied warranty lasts. The remedies described below are your sole and exclusive remedies and our entire liability for any breach of this limited warranty. Our liability shall under no circumstances exceed the actual amount paid by you for the product, nor shall we under any circumstances be liable for any consequential, incidental, special or punitive damages or losses, whether direct or indirect.

This warranty covers defects in materials and workmanship of your IAG Performance Product for 12 Months or 12,000 Miles from the date of receipt.

IAG will repair any IAG Manufactured Product that proves to be defective in materials or workmanship within the warranty period. If a repair is not possible, we will either replace your Product with a new Product of similar composition and price, or refund the full purchase price of your Product, at our sole discretion. There is no charge for inspection but the buyer is responsible for shipping charges.

IAG Performance Engine Warranty

For more information concerning our engine warranty please visit IAG Performance Engine Warranty Page

Other Manufacturer Products:

Products not manufactured by IAG are subject to the individual manufacturer warranties which may apply. If you have questions concerning the fitment, appearance, or performance of your item, please contact a member of our customer support team for assistance.

Our customer service team is happy to assist you with the products purchased from IAG Performance. Our support associates can help you with installation support, troubleshooting advice, and help to identify possible manufacturer defects.

For products that are found to have defects, our support department can provide the contact information for the manufacturer to arrange a warranty inspection and, if applicable, any necessary repairs or replacement shipments.

You may also contact the manufacturer directly for information regarding product eligibility and specific terms and conditions of warranty coverage.

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