Quote:
Originally Posted by tomm.brz
The wrx pcv will block anything coming from the manifold
Exactly like the check valve you want to put
The problem of the oem pcv is that it leaks from manifold to the block, with the wrx pcv you can skip the check valve
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Ok it's bad picture time
Attached picture showing the two scenarios I'm talking about - I can see that just using an STI PCV with a PCV catch can setup in front of it will reverse pressurize the PCV can which could then leak or cause issues with the catch can. I'm running probably 10ish PSI at redline so nothing crazy, so maybe I'm making too much of it. But it seems that a good billet check valve just at the manifold PCV inlet would be a better solution - shame that boomba doesn't sell them anymore, but somebody must! Having a hard time finding one the right size though. Anyway LMK your thoughts, maybe I'm overthinking it...