Perrin - Subaru 02-07 WRX/STI - Air Oil Separator (Red) subaru-ascent-2024 whereas triples are all solid

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

Larger Piston Diameter (22mm O

venting too much air can make the throttle less responsive

Group 24 OEM Automotive Case size (directly replace stock battery)

where it gets the most amount of airflow

Perrin - Subaru 02-07 WRX/STI - Air Oil Separator (Red) subaru-ascent-2024 whereas triples are all solidOVERVIEW 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