The United Kingdom’s vehicle market surveillance programme examined aftermarket motorcycle exhaust systems and silencers during 2025. Its report, published in October 2026, describes two distinct strands of work: checking online offers and measuring the noise from particular components. The findings concern the UK market; the figures do not describe motorcycle parts offered for sale in Latvia.
Following the surveillance work, eBay removed more than 2,400 listings and Amazon removed 124 for unbranded and non-approved exhaust products advertised as universal motorcycle parts. Removing an online offer is a market oversight outcome, not a laboratory measurement of every item in those listings. The report’s second strand should therefore be read separately: it covers a small group of physical exhaust systems that were actually measured.
The agency examined 12 aftermarket systems across three motorcycle models in a laboratory. Three met the noise-level requirements; six were above their approved levels but within the permitted 3 dB tolerance; and three did not meet the requirements. The agency is following up with makers and approval authorities concerning those three components. The report illustrates why a buyer needs more than an attractive appearance and a broad compatibility claim: the approval information for the particular motorcycle and intended use matters too.