Air Oil Separator (AOS)

• 2015–2021 Subaru | WRX

The Verus Engineering Air Oil Separator (AOS) ensures the intake system remains oil-free on your VA WRX. Oil in the intake system reduces octane, which can lead to detonation, a reduction in power, and carbon build-up. Four, 5-micron, coalescent filters — one on each inlet and outlet — plus internal baffling and stainless mesh offer unprecedented air filtration for the crankcase air. The AOS comes equipped with an easy-to-use drain plug for quick and effective maintenance, and an optional AOS coolant add-on kit tailors it to your specific needs and driving environment. Manufactured in Indianapolis, Indiana and anodized in three brilliant colors.

• Prevents oil from getting in the intake system — reduces the likelihood of power loss, carbon build-up, or detonation
• Superior oil separation using four 5-micron coalescent filters, internal baffling, and stainless mesh
• Easy-to-use drain plug for quick, effective maintenance
• AOS assembly: CNC machined in Indianapolis, Indiana from 6061-T6 aluminum, anodized in three colors (red, blue, black)
• Custom mounting bracket made specifically for the left-hand drive VA WRX
• Rubber hoses cut to length for a seamless installation; stainless hardware throughout with all necessary fittings
• Optional AOS coolant add-on kit and optional drain kit available for specific needs and driving environments
• Ships fully assembled and pressure tested
• Includes: assembled AOS (4 coalescent filters, internal baffling, stainless mesh), sheet steel bracket for VA chassis (LHD only), 3/4" rubber hose, 1/2" rubber hose, 3/8" rubber hose, hardware bag with all necessary parts for a seamless install
• Note: anodized parts can potentially fade over time due to engine bay heat
• Part Number: A0199A
• Fitment: 2015–2021 Subaru WRX (VA), left-hand drive

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