The R-304 Shorty silencer was developed as a full-race two-stroke silencer and was designed to increase power over stock exhaust. The compact design of the short aluminum canister 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. 304 stainless steel intake tube. Double-walled mounting brackets. 6061 T-6 brushed aluminum housing. E-Glass internal packing for maximum packing life. Lightweight with high-strength steel rivets and steel Allen head screws securing the inlet cap for easy repacking.