im not quite sure what you are talking about, my mark has 126k miles and never had a gummed up problem
If you took your intake manifold up and looked at the IMRC's you would tell me otherwise.
Just sayin.
X2
I had a separator on my PCV line and thinking of going with a catch can.
Every car can benefit from a catch can.
And you're right, the IMRCs may keep working... but at 126k they're gonna be pretty gross.
So your running no pcv back to the intake. Just a can with vents. I like that Idea. I haven't had any issues with the breathers spraying oil around yet but when the boost goes on I'll need the cans. Are you using a check valve for the vac lines to the hvac system?