Features: The 304 silencer is recommended for most two-stroke applications.. Feature a longer midsection than the R-304 for stronger mid to high RPM performance . Excellent replacement for the OEM silencer while offering impressive performance gains . 6061 T-6 brushed aluminum housing, stainless steel tubing and end cap . Double-walled mounting brackets . FIM-approved 304 stainless steel end cap . Steel Allen-head screws for easy re-building/ repacking . Exclusive E-glass pillow packing.