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Air Oil Separator (AOS) - Subaru WRX (VB)

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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. This is great for the FA24 engine found in the Subaru WRX.

Four, 5 micron, coalescent filters, one on each inlet and outlet, baffling, and stainless mesh offer unprecedented air filtration for the crankcase air. Further improving filtration is internal baffling within the AOS itself.

With optional add-ons like our AOS drain back kit and AOS coolant add-on kit, our AOS will fit your specific needs without an issue.

Anodized parts can potentially fade over time due to engine bay heat.

Note: Does not work with the CVT/SPT Transmission. Manual Fitment Only.


      • Assembled AOS
      • 4 Coalescent Filters
      • Internal Baffling
      • Stainless Mesh
      • CNC Bent Bracket, LHD Only
      • 1/2" Rubber Hose
      • 7/8" Rubber Hose
      • Hardware Bag, Including All Necessary Parts for a Seamless Install


      • Prevents Oil from Getting into the Intake System
      • Baffles for Further Separation of Oil Particles
      • Superior Oil Separation
      • Optional Drain Kit
      • Optional Coolant Kit


      • CNC Machined from 6061-T6
      • Mil-Spec O-Ring Bosses
      • Anodized for Corrosion Resistance
      • CNC Laser Engraved
      • Four 5 Micron Coalescent Filters
      • Made in the U.S.A.

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