2015-2021 Subaru WRX Air Oil Separator (AOS) by Cobb
The Cobb Tuning Air Oil Separator (AOS) is placed within the Subaru crankcase ventilation system to prevent oil vapors from entering the intake system. Developed in partnership with IAG Performance, the Cobb Tuning Air Oil Separator offers unique features.
Subaru FA engines have two ports that discharge crankcase pressure: one on each cylinder head and one on the top of the block. Each engine ventilation port receives its own dedicated connection to the AOS. By providing each engine port with its own dedicated inlet to the AOS, crankcase pressure can now be discharged more effectively and rapidly. Furthermore, this reduces overall system pressure. Measuring 4 inches in outer diameter and 5.75 inches in height, the AOS has a holding capacity of approximately 1 liter. A larger AOS allows for safer generation of more power without worrying about overfilling the AOS.
The bottom of the AOS is shaped like a snail, directing positive crank pressure into the same swirling pattern created by the three side ports. This allows for maximum oil drainage while separating oil from air at all ventilation ports. The AOS backplate features a unique coolant routing system that heats the entire AOS to the same temperature as the engine. This maximizes the evaporation of water accumulated inside the can. When the AOS is hot, less water collects inside to mix with the oil.
Features
- Billet aluminum tank design
- Custom Cobb Tuning anodized cap
- Wrinkle black powder-coated canister
- Laser-etched Cobb Tuning logo
- Developed in partnership with IAG Performance
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Applications
- 2015-2020 Subaru WRX
What's in the box?
- 1 - Cobb AOS
- Hoses and hose fittings
- Mounting bracket and mounting bracket hardware
References
Warranty
- Manufacturer Warranty
Before Placing an Order
〇 Regarding Import Consumption Tax
At Shaftoya Shopping Site, we pay the import consumption tax incurred at the time of import on your behalf, so there will be no additional charges beyond the total amount paid at checkout.
〇Compatibility Check
Our entire product database is based on North American specification vehicles (USDM), so please check the compatibility with Japanese specification vehicles (JDM) before ordering. (If you are unsure whether the listed product is compatible with your vehicle, please feel free to contact us. Our support team will investigate for you.)
If you place an order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if products are sorted by selecting the year, manufacturer, and vehicle model on the tabs of our homepage, this does not necessarily mean they will fit Japanese model vehicles without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us with any questions before ordering.
○ Regarding Delivery
Shipping costs are paid at the time of settlement. An estimate for shipping costs will be calculated automatically once you enter your shipping address on the checkout page. For large items such as body parts, there are rare cases where there is a significant discrepancy between the automatically calculated shipping cost and the actual shipping cost. In such cases, we will contact you individually via email.
All products are generally shipped internationally from our U.S. warehouse. Unlike domestic delivery within Japan, international shipping takes approximately 7 to 14 days, so please allow plenty of time for your order. If you are in a hurry, please contact us in advance to confirm the delivery date. All products are transported via air freight. They are never shipped by sea freight.
○ Regarding Japanese Vehicle Inspection Compatibility
All products we handle are basically designed and manufactured outside of Japan. Please understand that they are not compliant with the "Japanese Vehicle Inspection System," and we cannot provide strength calculation documents or similar materials for the Japanese inspection system. Therefore, all parts are sold for the purpose of "use on circuits, private property, or off-road," and installation and use are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival. As all products are shipped internationally from outside Japan, packaging boxes and products may sustain shipping damage. Please understand that we will only provide returns, refunds, or replacement exchanges for items with shipping damage, defective products, or products different from the order if contacted within 7 days of receipt. Furthermore, for products sold through us, support regarding the warranty will be provided "only through us." Please note that we do not provide support through other companies or distributors located within Japan.