Arrow 71130MO Thunder Carbon Slip-On Mufflers w/Steel End Cap for Ducati Hypermotard 1100 07-12Material : Carbon End Cap : Steel Approval : dB Killer : With dB Killer Note : Racing Exhausts for Original Collectors Arrow Street Thunder More and more new bikes are designed with very small silencers. moreover, these small silencers are also fitted in strange positions: these facts made necessary to use smaller and smaller exhaust systems also in the after market production. For these reasons Arrow decided to introduce in the Street Bikes silencers