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Vendor:IAG PerformanceIAG Air / Oil Separator (AOS) For 08-14 Subaru WRX, 08-21 STI, 09-13 FXT, 05-09 LGT & OBXT
Only 3 leftRegular price $499.99Sale price $499.99 Regular priceUnit price per -
Vendor:IAG PerformanceIAG Air / Oil Separator (AOS) Fits 2015-21 Subaru WRX, 2014-18 FXT
Regular price $499.99Sale price $499.99 Regular priceUnit price per -
Vendor:IAG PerformanceIAG Air / Oil Separator (AOS) Fits 2022-26 Subaru WRX
Only 14 leftRegular price $499.99Sale price $499.99 Regular priceUnit price per -
Vendor:IAG PerformanceIAG Air / Oil Separator (AOS) Fits 2002-07 Subaru Impreza WRX, 2004-07 STI, 2004-08 FXT
Regular price $499.99Sale price $499.99 Regular priceUnit price per -
Vendor:IAG PerformanceIAG Air / Oil Separator (AOS) For 2020-26 Outback XT, 2022-26 Outback Wilderness
Only 8 leftRegular price $499.99Sale price $499.99 Regular priceUnit price per -
Vendor:IAG PerformanceIAG Universal Air / Oil Separator (AOS)
Only 9 leftRegular price $499.99Sale price $499.99 Regular priceUnit price per -
Up to $22.50 OFFVendor:Radium EngineeringRadium Engineering Air Oil Separator - Return Kit For 2012-20 Subaru BRZ, 12-16 FR-S, 12-21 86 - 20-0351
Only 2 leftRegular price $427.45Sale price $427.45 Regular priceUnit price per$449.95 -
Up to $25 OFFVendor:Radium EngineeringRadium Engineering Air Oil Separator Kit For 2015-21 Subaru WRX, 14-18 FXT - 20-0258-00
Only 4 leftRegular price $474.95Sale price $474.95 Regular priceUnit price per$499.95 -
Up to $22.50 OFFVendor:Radium EngineeringRadium Engineering Air Oil Separator Return Kit For 2002-14 Subaru WRX, 04-21 WRX STi, 04-13 FXT - 20-0607
Only 10 leftRegular price $427.45Sale price $427.45 Regular priceUnit price per$449.95
Air Oil Separators
Shop Subaru Air Oil Separators (AOS) at IAG Performance for WRX, STI, Legacy GT, Forester XT, and BRZ models (2002–2023). Designed for EJ25, FA20, and FA24 engines, our selection includes AOS kits, lines, fittings, conversion kits, brackets, and hardware to improve crankcase ventilation and reduce oil blow-by. Whether you're protecting a daily-driven Subaru or a high-performance build, these AOS systems help maintain cleaner intake systems and long-term engine reliability. Featuring trusted brands like IAG Performance, Perrin Performance, and Radium Engineering.