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Old 06-28-2019, 04:51 PM   #45
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Join Date: Sep 2016
Location: Stow, MA
Posts: 917
Drone is a resonance that is caused by standing waves in the exhaust pipes. The reason why a cross pipe works is that a peak from a wave in one side is cancelled out by a trough on the other side The less muffling there is in an exhaust the more prone it is to droning.
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