| Year | Make | Model |
|---|---|---|
| 1997 - 2013 | Subaru | Forester |
| 2003 - 2014 | Subaru | Impreza |
| 2008 - 2014 | Subaru | Impreza WRX STI GR Sedan |
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COBB V3 AOS Air/Oil Separator | Subaru WRX/STI/Forester XT (02-08) (811615)
COBB V3 AOS Air/Oil Separator | Subaru WRX/STI/Forester XT (02-08) (811615)
SKU:811615
In stock
Regular price
$565.00 USD
Regular price
$565.00 USD
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$565.00 USD
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The COBB V3 Air/Oil Separator (AOS) is a precision-engineered crankcase ventilation component designed to improve the performance and longevity of Subaru engines. Developed in partnership with IAG Performance, this AOS effectively prevents oil vapors from entering the intake system, reducing carbon buildup and maintaining cleaner intake components. It features a compact cast aluminum body with a durable black powdercoat finish, a 1-liter holding capacity, and integrated ORB ports for efficient fluid management. Additional design highlights include heat shielding on the crankcase breather and oil return lines, a coolant bleeder valve, and a bespoke COBB color scheme with laser-etched branding, ensuring both functionality and aesthetic appeal.
This Air/Oil Separator is compatible with Subaru models from 2002 to 2007 WRX, 2004 to 2007 STI, and 2004 to 2008 Forester XT. It installs as a direct replacement within the factory crankcase ventilation system, making it suitable for street and performance driving applications. The unit’s design supports reliable operation under various conditions, including daily driving and spirited use. Its compact size and integrated features simplify installation and maintenance, providing a durable solution for reducing oil vapor contamination and enhancing engine efficiency across the specified Subaru platforms.
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Overview
Overview
COBB Air / Oil Separator (AOS)
Fitment: 2002-2007 WRX / 2004-2007 STI / 2004-2008 Forester XT
Part #: 811615
Overview
The COBB V3 Air / Oil Separator (AOS) is a precision-engineered component designed to enhance the crankcase ventilation system of select Subaru models. Specifically developed for the 2002-2007 WRX, 2004-2007 STI, and 2004-2008 Forester XT, this unit helps prevent oil vapors from entering the intake system, promoting cleaner airflow and reducing carbon buildup. Ideal for enthusiasts seeking improved engine reliability and maintenance ease, the COBB AOS supports long-term engine health by efficiently separating oil from crankcase gases.
Built in collaboration with IAG Performance, this separator offers exclusive features that combine durability, functionality, and style. Its compact design and robust construction make it a practical upgrade for Subaru owners focused on maintaining optimal engine performance and cleanliness.
Key Features
The COBB V3 Air / Oil Separator delivers a range of benefits through its thoughtful design and quality materials:
- 1 Liter holding capacity to effectively trap oil vapors and prevent intake contamination
- Integrated ORB ports for versatile hose routing and secure connections
- Compact cast aluminum body finished with a durable black powdercoat for corrosion resistance
- Heat shielding on crankcase breather and oil return lines to protect against thermal degradation
- Coolant bleeder valve to facilitate maintenance and system bleeding
- Distinctive bespoke COBB color combination with laser-etched branding for a refined appearance
Construction & Design
The separator’s cast aluminum construction ensures strength and lightweight durability, while the black powdercoat finish provides excellent resistance to corrosion and wear. Heat shielding on critical lines enhances longevity by reducing exposure to engine heat. The integrated ORB ports allow for clean and efficient hose connections, minimizing the risk of leaks or disconnections during operation.
Installation & Fitment
Designed as a direct fit for the specified Subaru models, the COBB V3 AOS installs within the existing crankcase ventilation system. While installation is straightforward, verifying fitment against your vehicle’s specific configuration and the part number is recommended to ensure compatibility.
