6.3.4.1. The vehicle type to be approved shall meet the requirements of Annex 6 to this Regulation. If the vehicle has user selectable software programs or modes which affect the sound emission of the vehicle, all these modes shall be in compliance with the requirements in Annex 6. Testing shall be based on the worst case scenario.6.3.4.2. In the application for type approval or for modification or extension of a type approval the manufacturer shall provide a statement in accordance with Annex 7 that the vehicle type to be approved complies with the requirements of Paragraphs 6.3.4. of this Regulation.6.3.4.3. The Type Approval Authority may carry out any test prescribed in this Regulation.