The experience and craftsmanship acquired over many years in the manufacturing process (attention to detail and obsessive pursuit of quality) of a Yoshimura escapement can never be reproduced, even by the best of machines.
Yoshimura presents the R11 motorcycle silencer:

• R11 muffler in Métal Magic finish (black)
  
• Single outlet on silencer
• Tapered design
  
• Carbon tip
• No CE approved
• Rounder, more aggressive exhaust note
• Warranty: 1 year
• The Yoshimura muffler is specific to each motorcycle