Air Oil Separator (AOS)

• 2008-2014 Subaru | WRX STI
• 2008–2014 Subaru | WRX

The Verus Engineering Air Oil Separator (AOS) ensures the intake system remains oil-free. Oil in the intake system reduces octane, which can lead to detonation, reduction in power, and carbon build-up. The unit installs like an OE component with no change to the tune or setup needed, and it filters both the crankcase vent and intake filter locations through a single unit.

• Keeps oil out of the intake system, reducing the likelihood of detonation, power loss, and carbon build-up
• Four 5-micron coalescent filters, one on each inlet and outlet
• Internal baffling and stainless mesh for thorough air filtration
• Installs like an OE component; no tune or setup changes required
• Optional coolant hook-up kit available to reduce condensation build-up in colder months
• Available in three anodized colors (black, blue, red)
• Kit includes assembled AOS with filters, baffling and stainless mesh, sheet steel bracket (GR/GV chassis, LHD only), 3/4 inch, 1/2 inch and 3/8 inch rubber hoses, and a hardware bag with all necessary parts
• Note: anodized parts can potentially fade over time due to engine bay heat
• Part Number: A0259A (BLK, BLU, RED variants)
• Fitment: 08-14 Subaru WRX STI (GR/GV)

Review our Shipping Policy for delivery details, shipping costs and exclusions.

Eligibility, exclusions, applicable fees and exceptions are detailed in our Return Policy. Restrictions apply to special-order and custom products.

Proposition 65 Warnings: cancer and reproductive harm www.p65warnings.ca.gov