Fitment:
2015-2021 Subaru STI
Features:
Keep your intake system oil-free with the Verus Engineering Air Oil Separator (AOS). Oil in the intake system can lower octane, leading to detonation, power loss, and carbon buildup. This AOS filters both the crankcase vent and the intake filter section in one unit. It features four 5-micron coalescing filters—one for each inlet and outlet—along with baffles and stainless steel mesh, providing unprecedented filtration of air within the crankcase. Direct bolt-on installation like OEM parts. No tuning or setup changes required.
The optional coolant hook-up kit circulates hot coolant into the AOS, reducing condensation during cold weather.
- Available in anodized black, red, or blue.
- Designed to prevent oil from entering the intake system.
- CNC-machined from 6061-T6 material.
- Mil-spec O-ring boss.
- Anodized for increased corrosion resistance.
- CNC laser engraved.
- Four 5-micron coalescing filters.
- Four coalescing filters that filter particulates 5 microns and larger.
- Stainless steel mesh to further condense oil vapor.
- Baffles to further separate oil particles.
- Includes all parts necessary for seamless installation.
- Made in the USA.
Included:
- Pre-assembled AOS (four coalescing filters, internal baffles, stainless steel mesh)
- Steel bracket for VA chassis - LHD only
- 3/4 inch rubber hose
- 1/2 inch rubber hose
- 3/8 inch rubber hose
- Installation hardware kit
Note: Anodized parts may fade over time due to engine bay heat.
Before You Order
〇 About Import Consumption Tax
At Shaftoya Shopping Site, we pay the import consumption tax incurred at the time of import on your behalf, so you will not be charged any additional fees beyond the total amount paid at checkout.
〇 Confirmation of Fitment
All product databases are based on North American vehicles (USDM), so please check the compatibility with Japanese vehicles (JDM) before placing your order. (If you are unsure whether the listed product fits your vehicle, please feel free to contact us. Our support team will be happy to look into it for you.)
If you place an order without confirming fitment, we cannot accept returns due to incompatibility.
Please note that even if a product is sorted by selecting the year, manufacturer, and vehicle model in the tabs on our top page, it does not necessarily mean it will fit a Japanese model vehicle without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ About Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are calculated automatically when you enter your shipping address on the checkout page. For large items such as body parts, there may occasionally be a significant discrepancy between the automatically calculated shipping cost and the actual cost. In such cases, we will contact you individually via email.
All products are generally shipped internationally from our US warehouse. Unlike domestic Japanese shipping, international shipping takes about 7 to 14 days, so please order with time to spare. If you are in a hurry, please contact us in advance to check the delivery time. Please note that all products are transported by air. They are not shipped by sea freight.
○ About Japanese Vehicle Inspection Compliance
All products we carry are basically designed and manufactured outside of Japan. Please note that they are not compliant with "Japanese vehicle inspection standards," and we cannot provide strength calculation documents or similar paperwork for these inspections. Therefore, all parts are sold for the purpose of "use on circuits, private land, or off-road," and installation and use are at your own risk.
○ About Warranty
Please inspect the contents immediately upon arrival. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging or the product itself. We will only provide returns, refunds, or replacements for damaged, defective, or incorrect items if you contact us within 7 days of receipt. Please understand that for products sold through us, warranty support will be handled "exclusively through us." We do not handle support through other companies or distributors located within Japan.