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.
