Up for sale is PRO CIRCUIT 2019 KX85 Kawasaki P/C R-304 SILENCER. The vendor part number is SK98080-R. Please read the title to know what is for sale The compact design of the R-304 Silencer offers optimum performance gains and is recommended for closed-course racing only. Hex head screws are used to secure the inlet cap and can be removed easily for quick re-packing of the silencer.