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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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2004 Boxster S Silver - FUNTOY
2002 Boxster Base Guardsy Red - FUNBOX
1987 Caterham Super 7 1700 Supersprint
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1941 Dodge Luxury Liner Coupe
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