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Introducing the Yoshimura RS-4E Signature Series competition systems, designed to meet restrictions most extreme sound systems in the world. These new systems have been developed to improve durability between maintenance cycles, thanks to a new internal configuration. The new component configuration allows for better sound/noise control – in the face of strict FIM regulations in world competition – compared to the RS-4, its legendary counterpart. Tested from the sands of Lommel, Belgium, to the factory Supercross tracks in Southern California.
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