yes you MUST close or plug those openings. usually there is an inlet hose to the air pump that has a connection at the clean side of the air filter. you have to close that or your engine will suck dirty air back in through that opening. put a rubber cap over it or put a plug in the hose. At the manifold you may have to make a little plate or someting to bolt tight to cover the hole - other wise you will have a bad exhaust noise.
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