COBB Air Oil Separator (811615) | Subaru WRX 2006-2007 / STI 2004-2007 / Forester XT 2004-2008

The COBB Air Oil Separator helps maintain cleaner intake airflow and reduces oil vapor buildup in turbocharged EJ engines. By separating oil mist from crankcase ventilation gases, this AOS system promotes improved engine efficiency, reduces carbon deposits, and supports long-term reliability for your Subaru WRX, STI, or Forester XT.

KEY FEATURES

• Reduces oil vapor entering the intake system for cleaner airflow
• Helps minimize carbon buildup on valves and intake components
• Improves long-term engine efficiency and consistency
• Designed specifically for turbocharged EJ engines
• Direct-fit installation using factory-style mounting points
• Durable construction engineered for high-temperature engine bay environments

TECHNICAL SPECIFICATIONS

• Multi-stage internal baffling separates oil mist from crankcase gases
• High-quality aluminum housing ensures long-term durability
• Utilizes OEM PCV system routing for proper engine breathing
• Includes brackets, hoses, and hardware for a complete installation
• Designed to maintain factory PCV operation while enhancing oil control

VEHICLE FITMENT

• Subaru WRX 2006–2007
• Subaru STI 2004–2007
• Subaru Forester XT 2004–2008

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