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Ships within 48 hours · Estimated delivery Aug 7 - Aug 12
Black stencil option
Full rear alignment flexibility that simply isn't possible with OEM hardware
40% increase in internal volume compared to stock hot-side pipe
Creates an aggressive blow-off valve sound
Hard anodized in black
IAG Performance Air Oil Separator AOS - Neon Yellow - 2008-2014 WRX / 2008-2021 STI / 2005-2009 Legacy GT Subaru-WRX-2017 Black stencil optionIAG Air Oil Separator AOS Neon Yellow 2008 2014 WRX 2008 2021 STI 2005 2009 Legacy GT Keep Oil Out of Your Intake The IAG Air Oil Separator (AOS) provides exceptional engine protection for the 2008 2014 Subaru WRX, 2008 2021 STI, and 2005 2009 Legacy GT. Developed over years of testing on standard and competitive applications, the IAG AOS uses a 1 liter cast aluminum swirl pot canister to dramatically improve oil separation from the PCV system before