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Perrin 15-18 Subaru WRX Wrinkle Red Air Oil Separator Kit - paPSP-ENG-609RD import_2022_03_21_012537 -cc Tonneau Covers::Bed Covers -The PERRIN Performance Air Oil Separator traps oil from the crank case vents before it enters the intake, thus increasing intercooler efficiency and reduces chances of performance robbing detonation. *Increase Intercooler Efficiency* The AOS increases intercooler efficiency by reducing the amount of oil deposited into your intercooler and intake system! As blow by oil builds up inside your intercooler, the less efficient it becomes due to less heat