PERRIN Air Oil Separator Black Stock TMIC

2002-2007 Subaru WRX / STI

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SKU: PSP-ENG-605BKWe price match!

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  • Made for proper clearance for those with top mount intercooler setups
  • Prevents harmful oil and vapors from coating your intake system
  • Prolongs the life and the performance of your engine
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PERRIN Air Oil Separator Black Stock TMIC


  • Traps oil from the crankcase ventilation before it enters the intake system
  • Reduces the chances of detonation 
  • Increases intercooler efficiency by reducing the amount of oil deposited into your intercooler and intake system
  • Reduces carbon buildup in the combustion chamber, intake valves, and intake tract
  • NOT a catch-can system
  • Separates engine oil from water vapors and allows the oil to drain back into the engine
  • Oil entering from the crankcase vents spins counterclockwise through the entire body of the AOS that passes along 4 walls equalling 50.25 square inches of surface area
  • Multiple baffle walls in the compact design simulate the surface area of an AOS that is 13.5" tall
  • Comes provided with all necessary hoses and hose fittings
  • Can comes with a black powder-coated finish
  • All hardware, brackets, fittings, and clamps are included to make this AOS system ready for the installation



  • 02-05 WRX will need to remove the Cruise Control Actuator in order to install the AOS



Here, you are looking at the PERRIN Performance Air Oil Separator designed to work with the stock top mount intercooler. This is a properly engineered kit designed to prevent harmful oil vapors from entering your intake system which can most definitely have an effect on your overall performance. 



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