No, a motorcycle does not have to be loud. The level of noise produced by a motorcycle depends on various factors, including its design, exhaust system, and modifications made by the owner. While some motorcycles may have louder exhaust systems for aesthetic or performance reasons, it is not a requirement for all motorcycles to be loud.
In fact, many modern motorcycles are designed to meet noise regulations and emission standards, which often involve noise reduction measures. Quiet or quieter motorcycles are becoming increasingly popular, especially among riders who value environmental concerns, prefer a more peaceful riding experience, or live in areas with strict noise regulations.
It's worth noting that excessive noise can be a source of disturbance and can potentially violate noise regulations in certain areas. It's important for motorcyclists to be considerate of others and respectful of noise limits imposed by local laws and regulations.