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 complete R77-S motorcycle line:

• Stainless steel manifold and fitting
  
• R77-S muffler, Titanium finish
• Carbon tip
• The R77-S silencer is a smaller, shorter version of the R77-J silencer
  
• Trapezoidal design
  
• Not approved
  
• Substantial weight savings: Original line 8.5 kg and Yoshimura line between 5.7 kg and 5.9 kg depending on finish
• Noise level: 93.5dB / 4,500rpm.
  
• Rounder, more aggressive exhaust note
• Warranty: 1 year
• The Yoshimura muffler is specific to each motorcycle