Radium Air Oil Separator-Return - FRS/BRZ/86 17" Wheels 2008-2014 STI - Yes

2008-2014 STI - Yes

Touring Editions feature patented drone-canceling 180 Technology®

Specifically designed for 14mm Head Studs

This air intake system was developed to accommodate the engine’s factory emissions control devices including the mass air flow sensor

Developed To Be Used In Conjunction With OEM or OEM Replacement Dampers

Radium Air Oil Separator-Return - FRS/BRZ/86 17" Wheels 2008-2014 STI - YesA high powered modified engine tends to generate excessive blow by oil and gasses. In these cases, an ordinary small catch can may quickly fill with oil and not be adequate. Like the Radium Engineering Catch Cans, the AOS (Air Oil Separator) kit is responsible for keeping blow by oil and other pollutants out of the air intake and intercooler (if equipped) systems. The main difference is that an AOS system returns collected oil back into the oil pan so