What is the fault when the engine exhaust sound becomes louder?

[Stephanie]

The reason for the increase in engine exhaust sound is: damage to the exhaust pipe muffler. Engine Introduction: An engine is a machine capable of converting various forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. Engine Working Principle: The working principles of two-stroke engines and four-stroke engines differ, with the majority of automobile engines being four-stroke. The working cycle of a four-stroke gasoline engine consists of four piston strokes: intake stroke, compression stroke, power stroke, and exhaust stroke.