This is the Silencer Body (aka: Muffler) for the FS-30 4-Stroke Engine / / FEATURES: Natural aluminum construction / Pre-installed pressure fitting / / INCLUDES: One muffler w/pre-installed pressure fitting / / REQUIRES: OSMG2621 43069000 HEADER PIPE ASSY / / SPECS: Length: 53.7mm (2.1") / Diameter: 17.8mm (.7") at widest point / / tjt 022802 / ir/jxs