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 R77-S motorcycle silencer:

• R77-S muffler in Métal Magic finish (black)
  
• The R77-S silencer is a smaller, shorter version of the R77-J silencer
  
• Trapezoidal design
  
• Carbon tip
• CE approved
• Rounder, more aggressive exhaust note
• Warranty: 1 year
• The Yoshimura muffler is specific to each motorcycle