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

• R11 silencer in stainless steel finish
• Single outlet on the silencer
• Conical design
  
• Carbon end cap
• CE approved
• Supplied with a heat shield
  
• Exhaust sound is rougher and more aggressive
• Warranty: 1 year
• The Yoshimura silencer is specific to each motorcycle