The Yoshimura RS-4 exhaust system was designed with one thing in mind,
winning races! The RS-4 is a unique design with predicated power and a
quiet exhaust note that speaks volumes for performance. It was an
obvious choice for the SX-F Factory Edition. AMA Pro Racing Sound Insert installed in the muffler.
Slip-On includes an RS-4 muffler, stainless steel tail-pipe, AMA Pro Racing Insert, all necessary hardware, and detailed installation instructions.
Low-Volume Insert and Spark Arrestor Chart