Perrin - Subaru 04-14 STI - FMIC Air Oil Separator (Red) subaru-wrx-2011 the billet wheel is point-milled

the billet wheel is point-milled to improve airflow and reducing turbulence with the bullet locking nut

The new design boasts a 76% increase in core volume and 81% bump in external fin surface area equating to a 34 F drop in outlet temperatures over the stock unit

The tiny outlet on the OEM BOV restricts the rate at which boost can be vented

Newly available are lightweight

installs in under one hour

Perrin - Subaru 04-14 STI - FMIC Air Oil Separator (Red) subaru-wrx-2011 the billet wheel is point-milledOVERVIEW 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