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OK, so this is a common issue with blow-through. A few solutions to choose from if you have to run blow-through :
1. Cap the port at the manifold and T both crank vents together to your AOS / Catch can inlet and run a single outlet to the pre turbo intake tube, this should always pull a vacuum on the case, but will not provide a source of fresh air circulation.
2. Vent both ports to atmosphere... downside is will never pull a vacuum on the case
3. Run a dual can setup like factory (intake side port pre turbo). Down side is you will want to re scale the maf to account for the vacuum leak when manifold pressure is less than atmospheric.
I would probably try #1 first and see what it catches in the can. I might try #3 but I don't have to rely on a tuner to re-scale my maf for me since i use BRZedit.
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