Singapore legislation
Regulation 106
of Road Traffic (Motor Vehicles, Construction and Use) Rules
Regulation 106
Use and maintenance of exhaust system
Subregulation 1
Any person who uses or causes or permits to be used on a road any vehicle propelled by an internal combustion engine with —
an exhaust system that is not approved for use by the Registrar;
an exhaust system or any part thereof which is not in good and efficient working order; or
an exhaust system or any part thereof which has been modified or altered in any way which is likely to prevent the exhaust system or any part thereof from working properly or efficiently,shall be guilty of an offence.
Subregulation 2
In this rule, “exhaust system” means a system in a vehicle consisting of a silencer, expansion chamber, exhaust pipe or other contrivance used individually or in combination with each other for the purpose of expelling exhaust gases into the atmosphere.