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
