Exhaust systems influence a vehicle’s noise, emissions, performance, and roadworthiness. However, modifications that appear minor can breach legal regulations for exhausts, particularly when they alter sound levels, pollutant output, or the vehicle’s approved specifications.
Requirements vary by jurisdiction and may cover exhaust design, catalytic converters, emissions testing, noise limits, and inspection standards. Understanding these rules is essential before replacing, modifying, or upgrading an automotive exhaust system.
Please provide the specific section or subheading from the outline you would like me to write.