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Description*Actual product may vary.The 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 mid-pipe, aluminum muffler sleeve, installation hardware, and detailed instructions to get you moving! Stainless Systems come with a USFS approved Spark Arrested insert installed in the muffler. Low-Volume Insert and Spark Arrestor Chart |