Radium Aos-R Kit, 2015+ Subaru Wrx, Includes 20-0255 KnockLink All Link G4+ and G4X

All Link G4+ and G4X Plugin ECUs

the 20-0093 PCV side kit is recommended

control the valve irrespective of manifold pressure

The preinstalled barbed fitting permits the OEM return line to be reused

- Exhaust Back Pressure

Radium Aos-R Kit, 2015+ Subaru Wrx, Includes 20-0255 KnockLink All Link G4+ and G4XHigh 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