Precision Works AOS Air Oil Separator – Subaru WRX 2015–2021

Part Number: PW-SUB-AOS-RED-WRX-15-21 / PW-SUB-AOS-BLK-WRX-15-21

Product Name or Type: Air Oil Separator (AOS)

Vehicle Fitment:

• 2015–2021 Subaru WRX

Description:

The Precision Works AOS is designed to separate oil from crankcase vapors, preventing oil contamination in the intake tract and intercooler system. Ideal for street and performance use, it helps maintain engine efficiency, reduces carbon buildup, and extends engine longevity. Compatible with the factory PCV system and easy to install with included fittings and hoses. Available in wrinkle red or black finishes to match your engine bay setup.

Key Features and Benefits:

• Retains OEM PCV valve functionality
• Prevents oil blow-by into the intake
• Improves engine cleanliness and performance
• Includes high-quality hoses, fittings, caps, and zip ties

Technical Specs / Material Info:

• Precision CNC-machined 6061 billet aluminum
• 1-liter internal capacity
• Compact cast aluminum body with powder coat finish
• Integrated ORB ports with three -8 ORB removable hose barbs
• Finish options: Wrinkle Red or Black

Installation Info:

• Direct-fit for 2015–2021 Subaru WRX
• All necessary hardware and hoses included

Images: