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The Yoshimura exhausts are developed in collaboration with the greatest US teams They trust them: TEAM Geiko, TEAM Rockstar Suzuki (Justin Barcia, Trey Teal, Eli Tomac, James Stewart) Le RS-4 is a complete aluminium/stainless steel exhaust with pentagonal exhaust silencer with carbon fibre end cap. Design with "poly-resonant duplex chamberā, making it more silent while increasing the power on the entire range of use. Shipped with one dB killer to meet FIM 2013 requirements of the noise and a second dB killer with spark-guard grill.