Changes made by Commission Directive 1999/101/EC of 15 December 1999 adapting to technical progress Council Directive 70/157/EEC relating to the permissible sound level and the exhaust system of motor vehicles
EU Directive 1999/101
No changes made by Commission Directive 1999/101/EC of 15 December 1999 adapting to technical progress Council Directive 70/157/EEC 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.