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the 20-0093 PCV side kit is recommended
Fits Type-R and Si models only
Multiple 3D Cam angle target tables
- Exhaust Back Pressure
Radium Aos-R Kit, 2015+ Subaru Wrx, Includes 20-0255 KnockLink the 20-0093 PCV side kitHigh 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
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