A secondary pipe filled with sound-absorbing material helps an exhaust muffler attenuate high-frequency noise without loose fiber packing hazards.
A movable tubular heat shield covers insulated exhaust junctions after clamping to block heat escape and debris ingress.
Balanced Nb-Mo-W alloying helps ferritic stainless steel withstand exhaust temperatures above 900°C while improving oxidation resistance and brazing.
Angled exhaust tubes and an acute-angle collector cut back pressure while preserving sound wave reflection for better two-stroke scavenging.
Opposed support brackets with vertical and horizontal bosses mount the exhaust purifier above the engine, saving space and simplifying assembly.