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one is a spot for the PCV to dump the blow by into the intake air for combustion.. another large one on the back of the filter "can" is the AS system.. air suction.. when there is a suction in the exhaust system it allows air into the cat so that any fuel that may have made it down that way can be burnt off.. As well as helping the cat in it's job.
I can't really think of anything else.. I think there is another hose that goes to the other port on the valve cover.. that allows fresh air in.. or something..
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