I've currently got my 2 heads and crank plumed into the catch can, with a tube then going from the catch can to the PCV and a third one venting to atmospheric. the way i figured is on boost its breathing through the vent and off boost the PCV is pulling a vacuum. I wanted to get the vent plummed through one of those oil cap AOS's back to the inlet so it is always pulling a vacuum but should still catch any oil vapour

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MY93 Impreza GX 1.8L, 0hp, 0nm