The Pro Circuit 304 Factory Sound slip-on silencer is a high-performance OEM replacement for most 2-stroke applications, designed to boost mid-to-high RPM power. Built with premium materials and a repackable design for long service life.
The Pro Circuit 304 Factory Sound Silencer is a proven slip-on upgrade for most two-stroke motocross and enduro bikes, delivering a noticeable improvement in mid-to-high RPM performance while serving as an excellent OEM replacement. With a longer midsection than the R-304, it’s designed to help your engine pull harder through the range where race bikes live.
It also makes ownership easier: the silencer is designed to be serviced, thanks to steel Allen-head screws that simplify rebuilding and repacking. Combined with Pro Circuit’s exclusive E-glass pillow packing and robust construction, you get consistent performance and a longer-lasting setup ride after ride.
