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search for thread title with "ventilation" or "crankcase". You can vent from any of the hoses; what's more important is how much vacuum is generated under what engine load. You can literally pull oil out of the crankcase and fill up the catch can with oil very quickly, which is not really what you want... You want oil/vapor separation with low suction at low load and high suction at high load, which is a little tricky on a boosted setup to find the right sources of vacuum at the right load points.