Thanks to all for the comments.
I edited the title of the post - you are right, proper is not the best phrasing. I was trying to come up with a system that best mimicked the stock system when using a CAI.
I know nothing about vacuum being better on the breather side, so I will default to Darrel Cox. I am using a check valve on the PCV side and a catch can on the breather side to collect any oil that would change the octane rating.
Thanks to all of this, I'm now back up in the air on what to do with my breather side - CAI nipple or it's own breather.........
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