Description  

The work that went into developing the RS-4 muffler design paid big dividends in 2010 with winning the AMA 450 Supercross and Motocross Championship series, and again in 2012 with both 250 Supercross Lites titles.

That same R&D has been directed to developing the current generation RS-4 — a unique design that provides an unrivaled combination of power and a quiet exhaust note.

The RS-4 features a Polyresonant duplex chamber, a two-staged stepped baffle and an innovative carbon cone end cap.

  • Pentagonal-shaped sleeve
  • Stainless steel muffler sleeve for increased durability
  • Two-stage stepped baffle
  • Turn-down carbon fiber end-cap
  • Stainless steel tail-pipe


    • This Yoshimura exhaust component or system meets EPA Noise Emission requirements of 80 dBA when installed on the specified motorcycle. Installation of this exhaust component or system on motorcycle models not specified may violate Federal Law.

     
       

     

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