Perrin - Subaru 04-14 STI - FMIC Air Oil Separator (Red) subaru-wrx-2011 The intake airbox is constructed

The intake airbox is constructed of 16 gauge aluminum

RECIRCULATION IS JOB #1

The new design boasts a 76% increase in core volume and 81% bump in external fin surface area equating to a 34 F drop in outlet temperatures over the stock unit

2001-2004 Subaru Outback 2

Exit Configuration: Twin Outlet

Perrin - Subaru 04-14 STI - FMIC Air Oil Separator (Red) subaru-wrx-2011 The intake airbox is constructedOVERVIEW 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