IAG V3 Street Series Air / Oil Separator (AOS) World Rally Blue 02-07 WRX / 04-07 STI / 04-08 Forester | 1 Liter Capacity | Engine Protection Upgrade
Overview
The IAG V3 Street Series Air / Oil Separator (AOS) is a precision-engineered solution designed to protect the engines of Subaru WRX, WRX STI, and Forester XT models from 2002 to 2008. This AOS effectively separates oil from the PCV (positive crankcase ventilation) gases before they re-enter the intake tract, preventing oil contamination that can degrade performance and cause long-term engine damage. Ideal for enthusiasts who demand reliability and longevity from their Subaru’s turbocharged engines, the IAG AOS is a smart upgrade that requires no routine draining or maintenance.
Developed through extensive testing on both street and competitive applications, the IAG AOS features a 1-liter cast aluminum swirl pot canister with a unique internal baffle system. This design maximizes oil separation efficiency while maintaining proper crankcase ventilation. The lightweight aluminum housing is finished in a durable powder coat with a distinctive World Rally Blue color exclusive to Subimods. The system integrates seamlessly with the factory PCV setup and includes custom-length SAE Quick Connection lines for a secure, leak-resistant installation.
By preventing oil from entering the intake system, the IAG AOS helps maintain clean intercooler and intake components, reducing the risk of detonation, pre-ignition, and power loss. This is especially important for Subaru owners who push their vehicles on the street, track, or in spirited driving conditions. The built-in heating system eliminates condensation buildup, ensuring the separated oil remains free-flowing and returns safely to the crankcase. This thoughtful engineering preserves engine health and performance, making the IAG V3 AOS a valuable addition to any Subaru enthusiast’s build.
Features & Specifications
This IAG Performance Air / Oil Separator is engineered for 2002-2007 Subaru WRX, 2004-2007 WRX STI, and 2004-2008 Forester XT models. Featuring a 1-liter cast aluminum canister with a powder-coated finish, it delivers superior oil separation and crankcase ventilation for Subaru enthusiasts seeking enhanced engine protection and reliability.
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Brand: IAG Performance
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Product: V3 Street Series Air / Oil Separator (AOS) World Rally Blue
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Part Number: IAG-ENG-7185WRB
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Fitment: 2002-2007 WRX, 2004-2007 WRX STI, 2004-2008 Forester XT
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Material: Cast Aluminum
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Finish: Powder Coat, World Rally Blue
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Construction: Cast Aluminum with Internal Baffle System
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Origin: Not Specified
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Capacity: Approximately 1 Liter
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Breather Ports: True 360 Degree Rotating Dual Ports
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Heating System: Integrated Coolant-Heat Transfer
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Hose Connections: Custom Length SAE Quick Connect Lines
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Maintenance: No Manual Draining Required
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Compatibility Note: Not Compatible with Most Strut Tower Bars
Key Benefits
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Engine Protection: Prevents oil contamination in intake and intercooler, reducing risk of detonation and engine damage.
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Maintenance-Free: No routine draining or manual maintenance needed thanks to the large capacity and intelligent oil drainage design.
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Improved Crankcase Ventilation: Maintains OEM PCV system function with enhanced vacuum and pressure control for optimal engine breathing.
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Durable Construction: Lightweight cast aluminum housing with powder coat finish resists corrosion and adds a clean, factory-quality look.
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Condensation Prevention: Exclusive heating system uses engine coolant to eliminate sludge buildup and maintain oil flow.
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Easy Installation: Custom-length SAE Quick Connect hoses reduce leak potential and simplify fitment on supported Subaru models.
What's Included
- 1× IAG V3 Street Series Air / Oil Separator (AOS) World Rally Blue
- Custom length SAE Quick Connection hoses
- Billet aluminum coolant swivel fittings
- All necessary fittings for installation
- Installation instructions for 2002-2007 WRX, 2004-2007 WRX STI, and 2004-2008 Forester XT
- Supplementary cruise control relocation instructions for 2002-2005 WRX
Installation & Compatibility
The IAG V3 Street Series AOS is designed for straightforward installation using the included custom-length SAE Quick Connect hoses and fittings. While the system is bolt-on and does not require routine maintenance, professional installation is recommended to ensure proper coolant line integration and secure hose connections. No special tools beyond standard hand tools are typically needed. This AOS maintains compatibility with factory ECU settings and does not require tuning adjustments. However, it is not compatible with most aftermarket strut tower bars, so verify fitment if your vehicle has chassis modifications.
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Professional Installation: Recommended
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Modifications Required: None beyond standard hose routing
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Verify Compatibility: Confirm fitment for your specific year and trim level before purchase
Shop with confidence at Subimods—your Subaru parts specialists.
