The 304 silencer is recommended for most two-stroke applications. The slightly longer body offers added top end performance while reducing noise output. The brushed aluminum body and stainless steel inlet tube and end-cap gives you a silencer that looks as good as it performs. Longer body design helps to reduce noise output 6061 T6 brushed aluminum silencer body Stainless steel end-cap Tig and mig welded for strength and durability Double-walled mounting bracket Allen head screws ensure easy repacking when needed for extended product life Made in the USA. SILENCER 304 1031985