Measurement of vehicle performance. 6.4.1. The NORESS or its components shall be such as to ensure that the vehicle’s performance is comparable with that achieved with the original exhaust silencing system or components thereof. 6.4.2. The NORESS or, at the manufacturer's choice, the components thereof shall be compared with an original silencing system or components, also in new condition, successively fitted to the vehicle referred to in paragraph 3.3. (c). 6.4.3. The verification shall be carried out by measuring the output curve in accordance with paragraph 6.4.4.1. or 6.
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Sources: Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles, Agreement Concerning the Adoption of Harmonized Technical United Nations Regulations for Wheeled Vehicles