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I have been looking into oil catch cans and am a little confused on some details. I understand larger cans will hold more and not need to be emptied as often, and ones with a micron filter will get nearly all the oil out while baffled ones will allow some oil to continue into the intake. My main question is the different port and breather options.
Some catch cans have 2 ports, some have 3, and some have a vent on them. What are the reasons for these differences and when would you want to use one over the other?