E-5 homologated 2-1 exhaust system. Matte black Cerakote finished stainless steel. With black aluminum end caps. Handcrafted from AISI 304 stainless steel. Note: No adjustments required to injection or ignition. Note: This is a EU homologated 2-1 exhaust system. 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. The approval number; shown on the supplied relevant certificate; is stamped on both mufflers and it must be presented to law enforcement when checked.