See only parts compatible with your vehicle

    Air Oil Separators

    Our excellent air oil separators will keep your Subaru WRX, STI, Forester, and Crosstrek operating at its peak. By efficiently capturing and separating oil vapors from the engine's crankcase ventilation system, these ground-breaking devices keep them from contaminating the intake system. Air oil separators encourage cleaner, more efficient combustion by minimizing the quantity of oil residue that enters the combustion chamber, which improves performance and minimizes carbon accumulation. Explore the air oil separators we offer from reputable brands like Crawford Performance, IAG Performance, and Perrin Performance. Enjoy the advantages of an engine that is cleaner and more powerful by upgrading your Subaru right away.

    Shop featured products

    52 Results

    COBB Tuning Air Oil Separator Black/Red - 2008-2014 Subaru WRX / 2008-2021 Subaru STI

    8 In Stock

    822615

    COBB Tuning Air Oil Separator Black/Red - 2008-2014 Subaru WRX / 2008-2021 Subaru STI

    5.0(4)
    $595.00
    GrimmSpeed Air/Oil Separator (Red) - 2002-2007 Subaru WRX / 2004-2021 Subaru STI

    12 In Stock

    078006R

    GrimmSpeed Air/Oil Separator (Red) - 2002-2007 Subaru WRX / 2004-2021 Subaru STI

    5.0(1)
    $315.00
    PERRIN Air Oil Separator Kit (Red) - 2015-2021 Subaru WRX / STI

    PSP-ENG-609RD

    PERRIN Air Oil Separator Kit (Red) - 2015-2021 Subaru WRX / STI

    $499.80
    IAG Performance V4 Air Oil Separator AOS - Black - 2004-2007 Subaru STI / 2006-2007 WRX

    IAG-ENG-7185BK

    IAG Performance V4 Air Oil Separator AOS - Black - 2004-2007 Subaru STI / 2006-2007 WRX

    $499.99
    PERRIN Air Oil Separator Kit (Black) - 2015-2021 Subaru WRX / STI

    1 In Stock

    PSP-ENG-609BK

    PERRIN Air Oil Separator Kit (Black) - 2015-2021 Subaru WRX / STI

    $499.80
    COBB Tuning Air Oil Separator Black and Red - 2015-2021 Subaru WRX

    4 In Stock

    843615

    COBB Tuning Air Oil Separator Black and Red - 2015-2021 Subaru WRX

    $610.00
    Verus AOS Kit, Anodized Blue - 2015-2021 Subaru STI

    1 In Stock

    A0323A-BLU

    Verus AOS Kit, Anodized Blue - 2015-2021 Subaru STI

    $389.95
    IAG Performance Air Oil Separator AOS - Neon Yellow - 2008-2014 WRX / 2008-2021 STI / 2005-2009 Legacy GT

    IAG-ENG-7186NY

    IAG Performance Air Oil Separator AOS - Neon Yellow - 2008-2014 WRX / 2008-2021 STI / 2005-2009 Legacy GT

    $499.99
    Radium AOS-R KIT T INCLUDES 20-0255 - 2015-2021 Subaru WRX / STI / 2014-2018 Forester XT

    6 In Stock

    20-0258-00

    Radium AOS-R KIT T INCLUDES 20-0255 - 2015-2021 Subaru WRX / STI / 2014-2018 Forester XT

    $474.95
    PERRIN Air Oil Separator (Red) - 2002-2014 Subaru WRX / 2004-2021 STI

    2 In Stock

    PSP-ENG-607RD

    PERRIN Air Oil Separator (Red) - 2002-2014 Subaru WRX / 2004-2021 STI

    $486.20
    PERRIN Air Oil Separator (Neon Yellow) - 2008-2014 Subaru WRX / 2008-2021 STI

    3 In Stock

    PSP-ENG-606NY

    PERRIN Air Oil Separator (Neon Yellow) - 2008-2014 Subaru WRX / 2008-2021 STI

    $486.20
    PERRIN Air Oil Separator (Neon Yellow) - 2002-2014 Subaru WRX / 2004-2021 STI

    20 In Stock

    PSP-ENG-607NY

    PERRIN Air Oil Separator (Neon Yellow) - 2002-2014 Subaru WRX / 2004-2021 STI

    $486.20
    GrimmSpeed Air Oil Separator Red - 2008-2014 Subaru WRX / 2005-2012 Subaru Legacy GT

    8 In Stock

    078016R

    GrimmSpeed Air Oil Separator Red - 2008-2014 Subaru WRX / 2005-2012 Subaru Legacy GT

    $315.00
    IAG Performance V4 Air Oil Separator AOS - Red - 2022-2024 Subaru WRX

    IAG-ENG-7188RD

    IAG Performance V4 Air Oil Separator AOS - Red - 2022-2024 Subaru WRX

    $499.99
    PERRIN Air Oil Separator (Red) - 2008-2014 Subaru WRX / 2008-2021 STI

    1 In Stock

    PSP-ENG-606RD

    PERRIN Air Oil Separator (Red) - 2008-2014 Subaru WRX / 2008-2021 STI

    $486.20
    Radium AOS-R Kit - 2008-2014 Subaru Subaru WRX / 2008-2021 STI / 2009-2013 Forester XT

    1 In Stock

    20-0607

    Radium AOS-R Kit - 2008-2014 Subaru Subaru WRX / 2008-2021 STI / 2009-2013 Forester XT

    $427.45
    Verus Engineering AOS Kit Red - 2008-2014 Subaru WRX/STI

    A0259A-RED

    Verus Engineering AOS Kit Red - 2008-2014 Subaru WRX/STI

    $369.95
    Grimmspeed Air/Oil Separator O-ring Rebuild Kit - 2002-2014 Subaru WRX / 2004-2021 STI

    17 In Stock

    078029

    Grimmspeed Air/Oil Separator O-ring Rebuild Kit - 2002-2014 Subaru WRX / 2004-2021 STI

    $13.00
    COBB Tuning Air Oil Separator Black/Red - 2002-2007 Subaru WRX / 2004-2007 STI

    2 In Stock

    811615

    COBB Tuning Air Oil Separator Black/Red - 2002-2007 Subaru WRX / 2004-2007 STI

    $565.00
    Verus Engineering Dual Air Oil Seperator Anodized Black - 2013-2021 Scion FR-S / Subaru BRZ / Toyota 86

    1 In Stock

    A0002A-BLK

    Verus Engineering Dual Air Oil Seperator Anodized Black - 2013-2021 Scion FR-S / Subaru BRZ / Toyota 86

    $389.95

    Page 1 of 3

    110% Price Match Guarantee*

    Find the same product for less on any competitor's site, and we'll match that price and beat if by 10% of the difference!* 

    Free Shipping*

    Free shipping is available within the lower 48 states for orders totalling $199 or more. Simply select the free shipping option during checkout.
    *Exclusions apply

    30 Day, 100% Satisfaction

    SubiSpeed Guarantee items may be returned within 30 days of the original invoice date and must include all the original parts and contents for a refund.