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  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)
  • IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX (IAG-ENG-7152)

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    IAG Street Series Air/Oil Separator | 2015-2018 Subaru WRX

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    2015-2018 WRX Street Series Air/Oil Separator

    The Subaru FA engine has 2 ports that vent crank pressure: two at 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 we have allowed for more effective and faster excavation of crankcase pressure. Additionally, this reduces overall system pressure. With a 4" OD and 5.75" height, the AOS has an approximate 1 liter of holding capacity. The larger the AOS, the more power you can safely make without having to worry about the AOS overfilling.

    As the air makes its way through the multi-stage baffle system, gravity pulls oil from the air. By increasing the overall volume of the breather opening on the top of the AOS, we have drastically decreased the exit velocity of the crankcase vent (CCV) stream. The slower velocity leads to greater oil separation from the pressure stream. A total of 9 mounting holes enable the breathing port a full 180° of rotation. On the bottom, a thick Viton o-ring seals the can. Every o-ring in our AOS is formed from Viton which offers superior temperature and chemical resistance. The bottom of the AOS is shaped like a snail, redirecting positive crank pressure into the same swirl pattern produced by the 3 side ports. Allowing maximum oil drainage while separating oil from the air in all the venting ports. The back plate of the AOS features a unique coolant routing system that heats the entire AOS to the same temperature of the engine. This maximizes the evaporation of any water collecting inside of the can. The hotter the AOS, the less water will collect inside and mix with the oil.

    The AOS arrives completely assembled and ready for immediate installation. However, the entire unit can be broken down for cleaning. With a single allen wrench, you can remove 4 bolts and the AOS easily separates into individual pieces. The AOS drain port is able to be rotated for ease of installation. All fittings supplied with the AOS are anodized aluminum and feature Viton sealed ORB fittings. The supplied coolant hose is built to SAE 20R3 standards. It will withstand coolant temperatures of +257°F. The oil vapor hose is designed to withstand oil and fuel vapors, exceeding SAE J30R7 standards. The center bracket allows for adjustable mounting. If your engine bay changes, you can easily change how and where you mount the AOS. A single laser-cut mounting bracket is included that fits nearly all applications and configurations. A laser cut harness relocation bracket is also included. The bracket allows the engine harness connector to be moved forward for additional clearance.

    Features

    • AOS Top - Dual Breather Port Rotation For Install Ease
    • AOS Top - Greater Pressure Stream Oil Separation
    • AOS Body - Large Billet Aluminum Design
    • AOS Body - Various Powdercoat Finishes Available
    • AOS Body - Approximate 1 Liter Holding Capacity
    • AOS Body - Integrated 3 Port Billet Hose Barbs
    • AOS Bottom - Unique Baffling Controls Crankcase Pressure
    • AOS Bottom - Returns Oil To The Engine
    • AOS Bottom - No Maintenance or Manual Draining Required
    • Ready to Install - Includes Hardware, Lines, and Fittings

    PLEASE NOTE

    IAG recommends the STREET SERIES AOS for ALL cars running E85 or high-ethanol fuel blends

    Applications

    • 2015 - 2018 Subaru WRX
    • *Incompatible w/ most aftermarket strut tower bars*

    Benefits

    • Superior Oil Separation
    • Maintains Proper Octane Rating
    • Reduces Risk of Detonation
    • Improves Performance of Engine Components

    What's In The Box?

    • 1 - Street Series AOS
    • 1 - Mounting Bracket
    • 1 - Coolant Hose
    • Mounting Hardware & Fittings
    • Instructions/Manuals (if applicable)
    • Warranty Information

    References

    Warranty

    • IAG Performance Warranty

    2015-2018 WRX Street Series Air/Oil Separator

    The Subaru FA engine has 2 ports that vent crank pressure: two at 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 we have allowed for more effective and faster excavation of crankcase pressure. Additionally, this reduces overall system pressure. With a 4" OD and 5.75" height, the AOS has an approximate 1 liter of holding capacity. The larger the AOS, the more power you can safely make without having to worry about the AOS overfilling.

    As the air makes its way through the multi-stage baffle system, gravity pulls oil from the air. By increasing the overall volume of the breather opening on the top of the AOS, we have drastically decreased the exit velocity of the crankcase vent (CCV) stream. The slower velocity leads to greater oil separation from the pressure stream. A total of 9 mounting holes enable the breathing port a full 180° of rotation. On the bottom, a thick Viton o-ring seals the can. Every o-ring in our AOS is formed from Viton which offers superior temperature and chemical resistance. The bottom of the AOS is shaped like a snail, redirecting positive crank pressure into the same swirl pattern produced by the 3 side ports. Allowing maximum oil drainage while separating oil from the air in all the venting ports. The back plate of the AOS features a unique coolant routing system that heats the entire AOS to the same temperature of the engine. This maximizes the evaporation of any water collecting inside of the can. The hotter the AOS, the less water will collect inside and mix with the oil.

    The AOS arrives completely assembled and ready for immediate installation. However, the entire unit can be broken down for cleaning. With a single allen wrench, you can remove 4 bolts and the AOS easily separates into individual pieces. The AOS drain port is able to be rotated for ease of installation. All fittings supplied with the AOS are anodized aluminum and feature Viton sealed ORB fittings. The supplied coolant hose is built to SAE 20R3 standards. It will withstand coolant temperatures of +257°F. The oil vapor hose is designed to withstand oil and fuel vapors, exceeding SAE J30R7 standards. The center bracket allows for adjustable mounting. If your engine bay changes, you can easily change how and where you mount the AOS. A single laser-cut mounting bracket is included that fits nearly all applications and configurations. A laser cut harness relocation bracket is also included. The bracket allows the engine harness connector to be moved forward for additional clearance.

    Features

    • AOS Top - Dual Breather Port Rotation For Install Ease
    • AOS Top - Greater Pressure Stream Oil Separation
    • AOS Body - Large Billet Aluminum Design
    • AOS Body - Various Powdercoat Finishes Available
    • AOS Body - Approximate 1 Liter Holding Capacity
    • AOS Body - Integrated 3 Port Billet Hose Barbs
    • AOS Bottom - Unique Baffling Controls Crankcase Pressure
    • AOS Bottom - Returns Oil To The Engine
    • AOS Bottom - No Maintenance or Manual Draining Required
    • Ready to Install - Includes Hardware, Lines, and Fittings

    PLEASE NOTE

    IAG recommends the STREET SERIES AOS for ALL cars running E85 or high-ethanol fuel blends

    Applications

    • 2015 - 2018 Subaru WRX
    • *Incompatible w/ most aftermarket strut tower bars*

    Benefits

    • Superior Oil Separation
    • Maintains Proper Octane Rating
    • Reduces Risk of Detonation
    • Improves Performance of Engine Components

    What's In The Box?

    • 1 - Street Series AOS
    • 1 - Mounting Bracket
    • 1 - Coolant Hose
    • Mounting Hardware & Fittings
    • Instructions/Manuals (if applicable)
    • Warranty Information

    References

    Warranty

    • IAG Performance Warranty

    Customer Reviews

    Based on 15 reviews
    80%
    (12)
    20%
    (3)
    0%
    (0)
    0%
    (0)
    0%
    (0)
    R
    R.
    iAG makes quality parts

    The build is excellent. Hoses are top notch. Buy some hose clamps like everyone says. But on some of the hoses, Zip ties are fine.

    I didn’t need the ECU relocation for 2019 WRX base. The harness just has to be manipulated around to make space for the hefty 1L bottle that is the AOS.

    I’ve own the car for about 5 months in California climate. I have the MAPerformance intake, and stage 1+ running fine. I am getting knocks of 1.41 but nothing too bad. When I took the intercooler off, it’s starting to have a thin layer of oily film.

    Some of the other jobs you should consider when attempting this one (since you do a lot of pulling out parts anyhow), are: pitch mount replacement (Perrin), pitch mount bracket reinforcement (Perrin), blow off valve of your choice, EGR, bigger charge pipe and/or intercooler.

    Take your time with the install!

    L
    L.V.
    Great product!

    Car runs a lot nicer install was fairly difficult but nothing anyone that has some experience under an engine can’t handle. Multiple people make the job a 100x easier.

    J
    J.A.
    Iag

    The always put out the best part and this is no exception!

    J
    J.
    Great product with terrible supporting hardware.

    I had taken off my intercooler to take care of an issue I had with the car and noticed a small film of oil on the inside of intercooler and chargepipe. I thought to myself, "Well, that's not good." Figured it was time to get an AOS. I picked this one specifically since it can upgraded to the Competition version rather easily and because it's self maintaining.

    The only issue, and reason for 4 instead of 5 stars, is that the instructions suck and you get zip ties. I didn't use the zipties and used clamps instead so you can always do that, but you'd think that you'd get some quality supporting hardware with a top notch AOS.

    A
    A.
    Solid part, worth the install time

    The install was a bit tedious and took some time, but all in all totally worth it compared to my catch can that this AOS replaced. My catch can would occasionally make a weird gurgling sound whenever the boost got over -10. Now that I’ve installed the IAG AOS, no more gurgling and no more checking/emptying the catch can every 1000 miles. Looks great and I’m happy I made the choice and did the upgrade.

    MAP Limited Lifetime Warranty

    1.) All MAPerformance in-house fabricated parts include a Limited Lifetime Warranty for the Original Purchaser. This warranty only applies to the original purchaser and is non-transferrable. If the product fails it would need to be determined by MAPerformance that it is due to manufacturing defects in materials or workmanship.

    2.) This does not cover normal wear and tear. Improper use, modification, or abuse voids this warranty. MAPerformance will not be held responsible for additional costs due to the failure of a product (cost of sale, towing, labor, etc.). Warranty claims must be submitted to MAPerformance for review.

    3.) You must create a support ticket to acquire your return authorization number prior to returning the product.

    4.) Warranty claims will not be honored if the product was not purchased through an approved dealer.

    For warranty evaluation please create a support ticket via this form here.

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