Changes made by Council Directive 84/424/EEC of 3 September 1984 amending 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 1984/424
No changes made by Council Directive 84/424/EEC of 3 September 1984 amending 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.