Perrin - Subaru 02-07 WRX/STI - Air Oil Separator (Red) subaru-ascent-2024 where it gets the most

where it gets the most amount of airflow

Twin-tube structure

Custom WRX/Legacy fitment compressor housing

whereas triples are all solid discs and not recommended for street use

NOTE: LUG NUTS ARE MADE WITH TAPERED BOTTOMS SPECIFICALLY FOR AFTERMARKET WHEELS

Perrin - Subaru 02-07 WRX/STI - Air Oil Separator (Red) subaru-ascent-2024 where it gets the mostOVERVIEW 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