Tomioka Racing Air Oil Separator for 02-07 WRX/STi

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The air and oil separator is a must have unit for all Subaru engines! Constructed from high-quality aluminum, this handy unit will help you lower emission, keep the intake charge pipe clean, reduce the oil burned in the engine and reduce the detonation due to a dirty intake charge pipe. Tomioka Racing AOS is compatible with factory PCV system, and it drains oil into the factory oil pan automatically.

  • Easy to install with less hoses and hardware needed
  • Easy twist-off cap, no tools needed to open cap
  • Equalizes pressure from crank case to cylinder heads
  • Compact & light-weight design to save space
Part Number: TR-AO1000


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