The Moroso Catch Can setup does not have any vacuum, so the engine is pushing out all the gases and any oil crud is caught in the catch can (at least that is how it hopefully will work). Being no vacuum, it should not be able to suck any unmetered air in through the canister, but should always be pushing it out. The can has baffles to separate the vapor from the oil.
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If it works as it is supposed to, the engine should be expelling all the vapor and crud without re-injecting it back into the cycle. I read that the vapor and crud can lower the amount of octane and cause detonation, if true, good riddance.
This PCV system stuff is confusing and has had me scratching my head thinking about loosing boost.....pressure where it shouldn't be. Get rid of the system in essence, hopefull get rid of any potential issues....but the environmental types might not like gagging on my vapor
Empty Garage, but Fat bank account