E5 homologated 4.5" diameter stainless slip-on muffler set. Handcrafted from AISI 304 stainless steel. With a chrome plated finish. With black aluminum end caps. Note: No adjustments required to injection or ignition. Note: This are EU homologated slip-on exhaust mufflers. Removing or modifying the Db killer on homologated mufflers will void the warranty and the homologation. Certification is valid for unmodified stock bikes; for the specific models and model years as mentioned in the product descriptions (Directive 97/24/CE; EU regulation 134/2014). The approval number; shown on the supplied relevant certificate; is stamped on both mufflers and it must be presented to law enforcement when checked.