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the bung is cut on a 45* angle and welded on a 45* of the down pipe. lol so it looks straight up and down, but it is not. If it were it would not work at all because there would be no way for the exhaust to pull enough air through it. when it is not in vacuum it does puff a tad of smoke, but if you blip the throttle with your hand on the hose you feel it sucking the air into the hose
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