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DescriptionThe RS-4 is a unique design with predicated power, a side benefit of a quiet earthy exhaust note that speaks volumes for performance. It was an obvious choice for the YZ450F.This Full System comes with a stainless steel header and tail-pipe, aluminum muffler sleeve, installation hardware, and detailed instructions to get you moving! An AMA-approved sound insert comes installed in the muffler, along with a 2 meter-Max insert in the box. Low-Volume Insert and Spark Arrestor Chart |