Perrin Black Air Oil Separator 2022-2023 WRX

The PERRIN Air Oil Separator captures crankcase oil vapors to reduce carbon buildup in the engine and intercooler, improving engine performance. Unlike a catch can, the AOS drains oil back to the engine, eliminating the need for frequent maintenance. Swirl pot technology and multi-layer baffles capture the most oil in a compact space, while heated coolant ensures the oil-air separation goes uninterrupted. Installing the AOS prevents oil from entering the intake, increasing intercooler efficiency and reducing power loss. Complete with low-profile aluminum fittings, powder-coated finish, and a turbo sump pump restrictor, the PERRIN Air Oil Separator is designed specifically for Subaru engines. Enjoy increased power and torque without the need for tuning!