Fits 2019-2023 Kawasaki KX450f Barely used and ready for you to slip on and rip. Massive POWER gains throughout the RPM range. Huge weight savings. Includes midpipe. Can be used with FMF header or stock. New RTS (Rapid Tuning System) makes for easy sound insert changes as well as adding U.S. Forestry Service Approved Spark Arrestor. #1 Exhaust in AMA Supercross Series, AMA Motocross Series, FIM Motocross of Nations and the Monster Energy Cup!