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Humming sound around 45mph

Engine

Model: CayenneS, Year:2006, Mileage:30200, Type of use:Street use only
I have an 06 Cayenne S with 30k in miles. The car has a very slight harmonic hum around 45mph that seems to go away around 50mph. It is very slight and there is no associated vibration to indiate it may be the Cardan shaft. Tires are Falkens with around 3k in miles. The sound has not gotten any better or worse. Driveabilty if fine. Thanks for your ideas.

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