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I’ve been running one of these on my Focus ST, along with a PCV (dirty side) catch can for about 10 years, tuned for about 5 years up to ~24 psi max boost. Early on, mostly stock, I was noticing some oil traces going to the turbo inlet from the CCV breather that, most of the time, lets clean...

Disclaimer: It should go without saying, but please do your own research before deciding on a different filter, just as you should before deciding on an aftermarket intake itself. I have personally run AEM filters for 10 years, no other non-OEM brands, but I have no affiliation and provide no...