In the United Kingdom, the legality of aftermarket exhaust systems, including those for the Honda Hornet, depends on several factors. Here are some general considerations:
Noise Levels: The exhaust system must comply with the legal noise limits set by the UK government. The specific noise limit can vary based on the type of vehicle and its category. Motorcycles are typically subject to noise limits of 80 decibels (dB) for road-legal exhausts. If an aftermarket exhaust exceeds the permitted noise level, it may be considered illegal.
Emissions Compliance: Aftermarket exhausts should not negatively impact the emissions performance of the motorcycle. They must comply with the emissions standards set by the UK government.
Approved Markings: Legal aftermarket exhaust systems should have appropriate markings or certifications to indicate their compliance with relevant regulations. For example, the exhaust may have an "E" mark or a certification from an approved authority.
Modifications and Certification: Modifying the exhaust system without proper certification or approval can render it illegal. It's crucial to check whether the aftermarket exhaust has undergone any necessary homologation or certification processes.
To ensure compliance with UK road traffic laws and regulations, it is advisable to consult the manufacturer or a reputable supplier of the specific aftermarket exhaust system you are considering for your Honda Hornet. They can provide information about the exhaust's legality, noise emissions, and compliance with UK regulations. Additionally, it's wise to consult local authorities or relevant organizations for the most up-to-date information on exhaust regulations and requirements in your area.