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

The Radium Engineering 2015+ Subaru STi Air Oil Separator-Return Kit separates oil mist and blow-by contaminants from crankcase vapors while allowing collected oil to return to the engine where the system is designed to do so. It is a clean way to reduce oil carryover through the intake on a modified or hard-driven engine without relying on a collection of universal hoses and brackets.

This version is designed around Subaru STi, so the mounting, routing, or connection details should be checked against that application before installation. Confirm vehicle fitment, crankcase return routing, and any left-hand/right-hand-drive restrictions before installation.