I live in the UK near a police station and every time the member of police go past in his private car it makes our whole house and windows vibrate due to his exhaust.
Although a subjective assessment, The MOT test manual does state that "a silencer in such a condition, or of such a type, that the noise emitted from the vehicle is clearly unreasonably above the level expected from a similar vehicle with a silencer in average condition" warrants a rejection.
if i were you i'd go into the police station and request a noise level test done as my friend got £60 fine and 3 points for his exhaust being too loud,
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