Search  for anything...

IAG Performance Air/Oil Separator (AOS) for Subaru Impreza WRX 08-14, STi 08-21 (Red)

  • Based on 19 reviews
Condition: New
Checking for product changes
$635.11 Why this price?

Buy Now, Pay Later


As low as / mo
  • – Up to 36-month term with PayTomorrow
  • – No impact on credit
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout. Payment plans are offered through our trusted finance partners Klarna, PayTomorrow, Affirm, Afterpay, Apple Pay, and PayPal. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

This item is eligible for return within 30 days of receipt

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.


Availability: Only 2 left in stock, order soon!
Fulfilled by IPC-STORE✅

Arrives Dec 1 – Dec 3
Order within 21 hours and 50 minutes
Available payment plans shown during checkout

Size: WRX 08-14, STi 08-21


Color: Red


Features

  • KEEPING OIL OUT - 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. 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.
  • 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. The EJ engine has 3 ports that vent crank pressure: one on each cylinder head, and another on the top of the block. Each engine vent port receives its own connection to the AOS. By giving each engine port its own entrance to the AOS, IAG has allowed for more effective and faster excavation of crankcase pressure.
  • SWIRL POT - The IAG Performance 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 IAG AOS' fully-heated cast aluminum housing, superior venting, and unique baffle design set it apart from the rest. The AOS is compatible with all fuel types, extends engine life, improves crankcase ventilation and is compatible with standard ECU calibrations.
  • TESTED FOR YEARS - The IAG Performance Street V3 Air / Oil separator (AOS) is an excellent investment to keep your EJ engine running well. The AOS maintains OEM PCV system functionality, but supplements its capacity. The IAG AOS design is based on years of extensive testing on standard and competition applications.
  • AOS BODY - Compact cast aluminum design has approximate 1 liter holding capacity integrated.

Manufacturer: ‎IAG Performance


Brand: ‎IAG Performance


Item model number: ‎IAG-ENG-7181RD


Exterior: ‎Red


Manufacturer Part Number: ‎IAG-ENG-7181RD


Date First Available: July 12, 2022


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Dec 1 – Dec 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • PayTomorrow Financing
  • Financing through Apple Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Download the installation guide before you start.
Size: WRX 15-21 Color: Red
Be sure to have the directions readily available from the iag website even if your following one of the online videos. Alot of those videos will have different modifications on the car so things will look a little different as you follow along. I've only had mine in there for a few days so far so good though. DIY time 2-5 hours. ... show more
Reviewed in the United States on November 11, 2022 by jarrett

  • Exactly as pictured
The item came in quickly without being damaged.
Reviewed in the United States on January 24, 2022 by Brayan

  • Do not trust this product
Size: WRX 15-21 Color: Red
The media could not be loaded. I have a 2021 Wrx Premium. To start off i think its good to add that i am an ASE certified Auto Tech. As im driving on the highway on my way home from work, i noticed that the coolant guage was higher than usual. I have the center dash screen set to Oil temp, boost pressure, and MPG. Oil temp was reading high at 235°F. Its always at 190-200. As i start heading towards a hill, the coolant temp guage spikes to HOT and get an overheating dash light. With no emergency lane nearby, i jump the curb and shut the engine off before catastrophic engine damage can occur. Waiting for a tow, i try to figure out what happened but with no lights or tools on hand, no luck. As my car arrives home with a $200 tow bill, i start to trace the coolant hoses and found the hose that leads directly from the AOS to the turbo coolant tube was loose. The provided clamp with the kit had given out and was no longer holding pressure as you can see in the attached video. Coolant had pissed out through the clamp. Ironic how i spent close to $500 for this system to better protect the engine, almost cost me an entire engine. Do yourself a favor and do not use the provided clamps. Youll thank me when you dont have to get towed to the dealer for a blown engine in which most likely they will not want to warranty as this is not an OEM Subaru part. Their excuse will be, “if this was not installed, engine wouldnt have blown”. ... show more
Reviewed in the United States on November 8, 2022 by Anibal Rosario Anibal Rosario

  • Clamps they give very cheap and flimsy
None like OEM silver clamps in the pictures, their black clamps have split ends. It is very hard to clamp it down and move it into the places and it easily go out of its shape. And do not hold much pressure NONE LIKE OEM which have solid ends and much thicker material.
Reviewed in the United States on July 26, 2023 by Amazon Customer Amazon Customer

  • Good quality
Took me little time to install but the quality is great.
Reviewed in the United States on February 14, 2023 by Minada

Can't find a product?

Find it on Amazon first, then paste the link below.