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whistle-tip

whistle-tip
 n.— «A “whistle-tip” is a device that is applied to, or is a modification of, a motor vehicle’s exhaust pipe for the sole purpose of creating a high-pitched or shrieking noise when the motor vehicle is operated.» —“Exhaust Systems: Whistle-Tip Prohibition” California Department of Motor Vehicles Jan. 1, 2004. (source: Double-Tongued Dictionary)

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