Changes made by Commission Directive 73/350/EEC of 7 November 1973 adapting to technical progress the Council Directive of 6 February 1970 on the approximation of the laws of the Member States relating to the permissible sound level and the exhaust system of motor vehicles
EU Directive 1973/350
No changes made by Commission Directive 73/350/EEC of 7 November 1973 adapting to technical progress the Council Directive of 6 February 1970 on the approximation of the laws of the Member States relating to the permissible sound level and the exhaust system of motor vehicles are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.