Precision Works AOS Air Oil Separator - Subaru WRX 02-14 STI 04-21

Precision Works AOS Air Oil Separator - Subaru WRX 02-07 STi 04-19

Air oil separator removes oil from engine ventilation system so the oil does not get into the intake system.

Key Features:

• Retains OEM PCV valve
• Engine performs cleaner & efficiently 
• Precision CNC machined
• 6061 billet aluminum
• High quality continental hose
  
• Includes fittings, caps, and zip ties
  

Designed to work with the following Subaru:

• Subaru WRX 2002 - 2007
• Subaru STI 2004 - 2021
• Subaru WRX 2008 - 2014
• Subaru Legacy GT 2005 - 2009

Check out the AOS system for the 2015+ WRX here.