Air Oil Separators Parts


Subaru STI - Air Oil Separators

Fitment Includes: 2004, 2005, 2006, 2007 Subaru STI

Air Oil Separators are one of the most important upgrades in the boxer platform, especially in a high-performance platform such as the EJ in the STI. Without one, harmful oil and vapors will travel past the factory PCV system and will make their way into the intake manifold. When this happens, your intake valves will get coated with carbon. Then the tops of your pistons will get coated with carbon. Your gas octane rating goes down. You experience detonation and misfires, which all leads to premature wear on your motor and performance. Because we only carry Air/Oil Separator Kits from the most reputable brands, these will prevent the said oil and vapors from entering your intake manifold, and this is a means of preventative maintenance which will prolong the life and performance of your Subaru.


Air Oil Separators
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