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Better durability and reliability over stock valves
Adds subtle carbon fiber style to your vehicle
Trust Company23 for precision engine tools built by professionals
OEM Hardware Reuse — Installs easily with factory mounting points
Perrin Air Oil Separator Red Subaru WRX / STI 2002-2021 | PSP-ENG-620RD Vehicle Model_Mustang Better durability and reliability overProduct Fitment: 2002 2021 Subaru WRX 2004 2021 Subaru STI The PERRIN Performance Air Oil Separator (AOS) is a premium engine protection system designed specifically for 2002 2021 Subaru WRX and 2004 2021 STI models. This red anodized aluminum separator prevents oil vapor contamination in your intake system, reducing carbon buildup and maintaining optimal engine performance for turbocharged Subaru engines. Key Features & Benefits Advanced Oil