Bikes aren't emissions tested so I can't see how it would change road legality. As long as it doesn't end up over a legal decibel level.
Seems pretty illegal...
https://www.gov.uk/government/publications/modifying-your-vehicles-emissions/modifying-your-vehicles-emissions-the-legal-safety-and-health-implications
@pdlouche started
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Bikes aren't emissions tested so I can't see how it would change road legality. As long as it doesn't end up over a legal decibel level.