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Q:

what is this loud sound underneath the rear of my car when I drive ? on 1993 BMW 325i

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
the faster I drive the louder it gets
(1) Answer
Bad tire wear (cupping on inside tread?). Rub your hand over the tread in the direction of rotation and see if it has high/low spots.