Euro 4 homologated. Slip-on chrome plated stainless steel replacement mufflers with catalytic converter and removable Db killer. Offers bolt-on installation ease onto the stock head pipes. The muffler is shorter and much less 'massive' overall, way better matching the sporty lines of the GT650. Like with all V Performance mufflers, the exhaust tone is nice and deep by using a special inner muffler cartridge design. The end cap is CNC machined Ergal (aluminum 7072). Note: Homologation is valid for unmodified stock bikes, for the specific models and model years as mentioned in the product description. Removing or modifying the standard Db killer will void the homologation. Note: See 708853 for the replacement Standard Db killer