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The work that went into developing the RS-4 muffler design paid big dividends in 2010 with Ryan Dungey winning the AMA 450 Supercross and Motocross Championship series as a rookie in the same year, and again in 2012 with the Yoshimura-backed GEICO Honda team winning 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.
* Deliver huge power at a very light weight
* Offers better handling thanks to a lower centralized mass coefficient
* Uniquely-styled pentagonal muffler body with a carbon fiber cone end cap
* Front cap design functions as a polyresonant chamber to lower dB output while improving mid- to top-end power
* Two-staged, stepped baffle
* Tapered headpipe delivers optimal flow and performance
* Systems include 94 dB insert installed (meets AMA competition requirements), 2 meter Max insert in the box
Yoshimura RS-4 Slip-On Exhaust for YZ450F 18
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