lifted from another Forum :
7.1.2.b "A silencer in such 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."
"Unreasonably above" are the key words as this indicates that above the normal level is acceptable and thus leaves it at the discretion of the tester to decide if it is unreasonable.
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