Product Description
Fitment Information:
2008-2014 Subaru WRX w/ Top Mount Intercooler
2008-2021 Subaru STI w/ Top Mount Intercooler
Features:
Reduces the chances of detonation
Traps oil from the crankcase ventilation before it enters the intake system
Increases intercooler efficiency by reducing the amount of oil deposited into your intercooler and intake system
Reduces carbon buildup in the combustion chamber, intake valves, and intake tract
Separates engine oil from water vapors and allows the oil to drain back into the engine
Durable Wrinke Red Powder Coating
Difficult Installation Effort
Estimated Installation Time - 3 Hours
Installation Instructions
No Tuning Required
What's in the Box:
(1) PERRIN Air Oil Separator
(1) Car Specific Bracket
(1) PERRIN License Plate Frame
All necessary hardware for installation
Warranty & Instructions
As blow-by/oil builds up inside your intercooler, the less efficient it becomes due to less heat being transferred away from your engine. This leads to power loss and detonation, which can be damaging to your engine. The AOS will reduce carbon build up in the combustion chamber, intake valves, and in your intake tract. The crank case blow-by is recirculated back to the intake to be ingested by the engine, but in doing so, gets stuck in the intake tract, intake valves, and the intercooler. This builds up over time which causes a loss in power and extra wear and tear on your valve train.
Usually ships within 2 days. 
