Fast, Free Shipping W/ Insurance On Orders Over $199
Mon-Fri 6am - 6pm
+1-888-627-3736 Speak To An Expert
Choose Your Car 
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)
  • IAG Street Series Air/Oil Separator | Multiple Subaru Fitments (IAG-ENG-7151)


    IAG PERFORMANCE

    IAG Street Series Air/Oil Separator | Multiple Subaru Fitments

    PART#
    We Price Match!

    Contact us to ensure you're getting the right part for your car at the absolute best pricing on earth!

    Email - sales@maperformance.com
    Phone 1(888)627-3736



    $ 399.99   $ 419.99
    You Save % ()



    This item is built to order
    and typically ships in 10-14 Days!

    If ordered within hours and minutes
    This item can be delivered by ,
    Fits Your
    MAP Loyalty: Earn $ 8.00 Toward Next Purchase!

    2008-2014 WRX/2008-2017 STi Street Series Air/Oil Separator

    The Subaru 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 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

    • 2008 - 2014 Subaru Impreza WRX
    • 2008 - 2014 Subaru Impreza WRX STi
    • 2015 - 2017 Subaru WRX STi
    • 2005 - 2009 Subaru Legacy GT
    • *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

    2008-2014 WRX/2008-2017 STi Street Series Air/Oil Separator

    The Subaru 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 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

    • 2008 - 2014 Subaru Impreza WRX
    • 2008 - 2014 Subaru Impreza WRX STi
    • 2015 - 2017 Subaru WRX STi
    • 2005 - 2009 Subaru Legacy GT
    • *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 18 reviews
    89%
    (16)
    11%
    (2)
    0%
    (0)
    0%
    (0)
    0%
    (0)
    A
    A.
    Quality product from a quality vendor!

    Great product from IAG ofcourse, they never fail customers on their product! MAPerformace was pretty helpful over the phone if you have questions regarding your build or what "car parts" you should get to match your build goals. Honestly, AOS is the first thing a subie owner should buy for the longevity of your engine. Will definitely buy this again!

    J
    J.R.
    IAG AOS

    Excellent product!!! As to be expected from IAG everything fit perfectly. And best part my oil consumption went down a bit always a plus for a subie.

    G
    G.P.
    Great for Longevity for STi

    Now first thing first got Maperformance thank you in the part. The problem that I have with this is everything is held by zip ties which is by far the worst idea but honestly this install is time consuming and should have a video instead for the install not paper work like how we use to use a book before all data was invented. Hopefully now my car doesn't have to blow up like it did the first time being stock.
    I don't suggest it as your first mod but I suggest you get it once you hit 10k and notice the oil lose and calculate how many times you have to top every month. Honestly it's about saving money after doing a oil change and stop buying a quart of oil. Also I think this sis something you should do yourself cause I brought the part for 400$ and then the labor to get it done is honestly foul meaning another $400.

    E
    E.
    Great Product

    I recieved the item within 4 days which is a reminder of why I shop with MaPerformance. Installed the AOS myself and it wasn't too bad. My recommendation when installing is to just be patient and make sure everything is connected and clamped up correctly. I am very happy I went with the IAG over other brands, as you do get what you pay for with IAG AOS being the best.

    A
    A.V.
    must get!!

    this is a must get mod !!!

    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.

    We use cookies to offer a better browsing experience, analyze site traffic, personalize content, and serve targeted advertisements. Please review our privacy policy & cookies information page.  If you continue you consent to our privacy policy & use of cookies.Accept

    Hello!

    Unfortunately due to vendor restrictions we are unable to sell this brand within Australia or the UK. If you have any questions, feel like you received this message in error or would like suggestions on other brands please contact us here.

    Hello!

    Unfortunately due to vendor restrictions we are unable to sell this brand within Australia. If you have any questions, feel like you received this message in error or would like suggestions on other brands please contact us here.

    Hello!

    Unfortunately due to vendor restrictions we are unable to sell this brand within your country. If you have any questions, feel like you received this message in error or would like suggestions on other brands please contact us here.

    Hello!

    Unfortunately due to vendor restrictions we are unable to sell this brand within California. If you have any questions, feel like you received this message in error or would like suggestions on other brands please contact us here.