Perrin - Subaru 08-14 WRX/STI - Air Oil Separator (Black) subaru-wrx-2026 375" thick flanges are used

375" thick flanges are used for a complete 360-degree sealing surface

Billet 6061-T6 Construction

To control this front-to-back twisting

Increased clamp loads give the necessary capacity to handle modified engines

Perrin - Subaru 08-14 WRX/STI - Air Oil Separator (Black) subaru-wrx-2026 375" thick flanges are usedOVERVIEW The PERRIN Air Oil Separator traps oil from the crankcase vents before it enters the intake, reduces carbon build up, increases intercooler efficiency, which reduces the chance of performance robbing detonation. NO TUNING REQUIRED Increase horsepower and torque without ECU recalibration or tune! This part is designed and tested to work safely on your vehicle without any tuning required! However, more power can be gained with proper ECU