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This COBB air‑oil separator is a vehicle‑specific unit for Subaru WRX models from 2015–2020. Built to separate oil from crankcase vapors before they return to the intake, it helps limit oil accumulation inside the intake tract. The part is offered as a direct‑fit solution for the listed model years to simplify installation and maintenance of turbocharged Subaru engines.
Cobb 15-20 Subaru WRX Air Oil Separator
