This standard specifies the selection and design of resistant exhaust mufflers for gasoline engines without catalytic converters below 30 kW. This standard applies to resistant exhaust mufflers (hereinafter referred to as mufflers) without catalytic converters for gasoline engines below 30 kW.
JB/T 5141-2014 Referenced Document
GB/T 4759 Exhaust silencers for internal combustion engines.Measurement procedure