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 02-07
- Subaru STi 04-19
Check out the AOS system for the 2015+ WRX here.