Perrin - Subaru 08-14 WRX/STI - Air Oil Separator (Black) subaru-wrx-2026 Billet 6061-T6 Construction

Billet 6061-T6 Construction

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

There is nearly a full inch of horizontal play to the shifter mechanism while in gear in the two outer gates (1-2 and 5-6) from the factory

To control this front-to-back twisting

The Stage 1+ Drivetrain Package Includes: Subaru 6-Speed Front Shifter Bushing

Perrin - Subaru 08-14 WRX/STI - Air Oil Separator (Black) subaru-wrx-2026 Billet 6061-T6 ConstructionOVERVIEW 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