What must be present in a motorcycle's exhaust system?

In a motorcycle's exhaust system, a baffle is crucial for controlling the noise produced by the engine. The baffle serves to reduce sound levels by disrupting the flow of exhaust gases, thereby minimizing the loudness of the noise emitted when the motorcycle is running. This is important for compliance with local noise regulations and for maintaining a more pleasant riding experience for both the rider and those nearby.

While other components like mufflers also contribute to noise reduction, the specific function of the baffle in manipulating exhaust flow is a key aspect of an effective motorcycle exhaust system. A muffler may be present as well, but it integrates the baffle as part of its overall design. Thus, the presence of a baffle is essential for ensuring that a motorcycle operates within acceptable noise levels, enhancing both performance and legal compliance.