Radium Engineering Air Oil Separator (AOS-R) Kit 2002-2014 WRX / 2004-2021 STI / 2004-2013 Forester XT

High-powered modified Subaru engines tend to generate excessive blow-by oil and gasses. In these cases, an ordinary small catch can may quickly fill with oil and not be adequate. Like the Radium Engineering , the AOS (Air Oil Separator) kit is responsible for keeping blow-by oil and other pollutants out of the intake pipe, manifold, turbocharger, and intercooler during all engine loads. The main difference is that an AOS-'R' system 'returns' what is collected back into the oil pan so there is no servicing required. 

The built-in heater keeps water from condensing in the AOS. And because water is more dense than oil, there is an integrated water trap found around the bottom perimeter of the can.

Includes:

• Machined alumium Radium Engineering Air Oil Separator
  
• Subaru specifically designed mounting bracket
  
• All necessary SAE J30R7 rated PCV/Emissions hose
  
• Coolant hoses and fittings
  
• All necessary aluminum fittings and hose-ends
  
• Stainless steel mounting hardware

Notes:

• For 02-05 Subaru with a cable-actuated throttle body, Radium Cruise Control Relocation Bracket must be used.
• If operated in freezing environments, Radium Engineering recommends installing insulation sleeving (not included) over any hose exposed to cold air flow. This will help prevent the natural phenomenon of water condensation freezing and potentially clogging the hose.
• For RHD vehicles, Radium Universal AOS-R must be used for custom mounting and plumbing.
• The Radium AOS-R kit may not be compatible with all other aftermarket products.
• Fits 2005-2006 Saab 9-2X Aero

Installation Instructions