COBB Air Oil Separator (822615) | Subaru WRX 2008-2014 / STI 2008-2021 / Forester XT 2009-2013 / Legacy GT 2005-2009 / Outback XT 2005-2009

The COBB Air Oil Separator helps maintain cleaner engine operation by reducing oil vapor buildup within the intake system on EJ-powered Subaru WRX, STI, and XT/GT models. By separating oil mist from crankcase ventilation gases, this AOS system supports improved engine efficiency, reduced carbon accumulation, and more consistent long-term performance.

KEY FEATURES

• Removes oil vapor from PCV gases to maintain cleaner intake airflow
• Helps reduce carbon deposits on valves and intake components
• Promotes more stable engine operation under boost and high-temperature conditions
• Designed specifically for EJ-platform turbocharged Subarus
• Direct-fit installation using model-specific brackets and hose routing
• Durable design engineered to withstand harsh engine bay environments

TECHNICAL SPECIFICATIONS

• Multi-stage internal baffling efficiently separates oil from crankcase gases
• Robust aluminum housing ensures strength, heat resistance, and longevity
• Utilizes factory-style PCV routing for proper engine breathing behavior
• Includes mounting bracket, hoses, fittings, and installation hardware
• Designed to maintain OEM PCV system functionality while improving oil control

VEHICLE FITMENT

• Subaru WRX 2008–2014
• Subaru STI 2008–2021
• Subaru Forester XT 2009–2013
• Subaru Legacy GT 2005–2009
• Subaru Outback XT 2005–2009

COBB delivers proven, data-driven performance solutions engineered to optimize your Subaru with unmatched precision and reliability.