Mishimoto 2022+ Subaru WRX Baffled Oil Catch Can PCV SideBlow by is an unavoidable side effect of forced induction. When pressurized gasses are recirculated through the PCV system, oil particles are carried in that air which causes your intake system and intake valves to become coated in oil. Over time this can lead to carbon buildup on valves and reducing octane levels in the combustion chamber by introducing oil to the air fuel mixture. Direct injection engines, like the FA24DIT in your 22+ WRX, are