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 output6061 T6 brushed aluminum silencer bodyStainless steel end-capTig and mig welded for strength and durabilityDouble-walled mounting bracketAllen head screws ensure easy repacking when needed for extended product lifeMade in the USA