Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit

Radium Engineering 20-0607 - Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit.

The Radium air/oil separator traps blow-by oil before it can be sent back to the induction system. The collected oil is heated by the AOS to remove moisture, then allowed to drain back into the engine block, making this a zero maintenance system.