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(1) Large O-Ring
Our special solenoid features
you can reduce your shift times
With large inlets and outlets
Knurled ends for easy installation
Perrin - Subaru 15-21 WRX - Air Oil Separator Kit (Wrinkle Black) BF2025 (1) Large O-RingOVERVIEW 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
