The R-304 silencer was developed as a full-race two-stroke silencer. For maximum performance, the silencer does not include a USFS spark arrestor. 6061 T6 brushed aluminum silencer body. R-304 Silencer.
Pro Circuit and Kawasaki is like a Cold Beer and Pizza! Perfect match! Sound is awesome. Power through out! Pro Circuit has been my go to since my first KX!!!!