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Yoshimura R&D has developed the RS4 for Off-Road Bikes — a design that provides an unrivalled combination of power and a quiet exhaust note. The RS4 features a Pentagonal aluminium muffler sleeve with a carbon fibre end-cap and a two staged baffle. The front end-cap has a noise reducing Polyresonant duplex chamber. 94db and 2mMax inserts included. All parts required for fitment are included (fittings/link pipe etc.) with full fitting instructions and is developed to fit without fuel modification.
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