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I recently upgraded my Turbo and the silicone or rubber grommet on the intake disintegrated. the replacement has an open bung or port. I have never had anything connected there since I owned my car on the oem pipe. I have seen a couple pics that show it connected to a pipe. I previously had a sensor plugged in but nothing on the bung
what is this? I don't want to let unmetered air in and don't want to leave something unconnected