The 304 silencer is recommended for most two-stroke applications.Feature a longer midsection than the R-304 for stronger mid to high RPM performanceExcellent replacement for the OEM silencer while offering impressive performance gains6061 T-6 brushed aluminum housing, stainless steel tubing and end capDouble-walled mounting bracketsFIM-approved 304 stainless steel end capSteel Allen-head screws for easy re-building/ repackingExclusive E-glass pillow packing