Is it permissible to install open or cut-out mufflers on a motorcycle?

Installing open or cut-out mufflers on a motorcycle is generally prohibited because they create excessive noise levels that can be harmful to the rider's hearing and disruptive to the surrounding environment. Noise regulations in many jurisdictions, including Guam, are designed to promote safety, protect public peace, and avoid disturbances caused by loud vehicles.

Motorcycles must be equipped with mufflers that meet certain standards set by local laws to ensure a reasonable noise level. Open or cut-out mufflers typically do not conform to these standards, leading to potential legal issues, fines, and safety concerns. By encouraging appropriate exhaust systems, regulations enhance the riding experience while also considering the community's well-being.

In specific areas or racing situations, there may be exemptions, but these do not apply under general conditions. Therefore, the standard rule is that the installation of open or cut-out mufflers is not permissible.