Billet Aluminum Oil Catch Can

It functions by intercepting oil vapor from the crankcase and head ventilation air before it can enter the intake tract. This process prevents oil from coating intercooler cores, charge pipes, and intake valves, which can lead to reduced intercooler efficiency and potential long-term issues like intake valve deposits. The captured oil collects in an easy-drain reservoir, allowing for periodic removal during routine maintenance without needing to disassemble the unit. The included hardware and lines ensure a straightforward installation that connects inline with the existing PCV system. The unit is noted as being compact and effective. Fitment for this GrimmSpeed Air/Oil Separator includes the 2002-2007 Subaru WRX (EJ20) and the 2004-2021 Subaru WRX STI (EJ257).