Perrin - Subaru 08-14 WRX/STI - Air Oil Separator (Red) subaru-wrx-2025 Over time the factory hoses

Over time the factory hoses become brittle and crack

0T) 2015-21

4-ply Steel Reinforced Silicone Post-MAF

Replacing the factory main pulley

Perrin - Subaru 08-14 WRX/STI - Air Oil Separator (Red) subaru-wrx-2025 Over time the factory hosesOVERVIEW 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