Sounds like you have some research ahead of you.
The ones with filters are for deleting your PCV system and venting the crankcase to atmosphere. My best guess on the pressurized/non-pressurized is one is whether or they can handle boost. (edit: Rusty has this correct below)
I'm with Betty though, I bought some inexpensive ones and they seem to work fine.
Last edited by Jayhovah; 05-25-2019 at 09:05 PM.
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