The 304 Silencer is recommended for most two-stroke applications. The slightly longer body offers additional 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. Features Include: 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 hardability Double-walled mounting bracket(s) Allen head screws ensure easy repacking when needed for extended product life Made in the USA