Changes made by 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 (70/157/EEC)
EU Directive 1970/157
No changes made by 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 (70/157/EEC) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.