Perrin - Subaru 04-14 STI - FMIC Air Oil Separator (Red) subaru-wrx-2011 The tiny outlet on the

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

This adjustment is important in maintaining the air within the boost system without reducing turbo response

Newly available are lightweight

Proper selection of friction material

Perrin - Subaru 04-14 STI - FMIC Air Oil Separator (Red) subaru-wrx-2011 The tiny outlet on theOVERVIEW 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