Radium Aos-R Kit, 2015+ Subaru Wrx, Includes 20-0255 KnockLink control the valve irrespective of

control the valve irrespective of manifold pressure

- Exhaust Back Pressure

Fits Type-R and Si models only

use PFF44-106R

- QuickTrim for calculated VE table correction while tuning

Radium Aos-R Kit, 2015+ Subaru Wrx, Includes 20-0255 KnockLink control the valve irrespective ofHigh powered modified Subaru engines tend 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 Subaru Dual Catch Can Kit, the AOS (Air Oil Separator) kit is responsible for keeping blow by oil and other pollutants out of the intake pipe, manifold, turbocharger, and intercooler during all engine loads. The main difference is that an AOS