Changes made by Commission Directive 84/372/EEC of 3 July 1984 adapting to technical progress Council Directive 70/157/EEC 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 1984/372
No changes made by Commission Directive 84/372/EEC of 3 July 1984 adapting to technical progress Council Directive 70/157/EEC 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.