The Briggs & Stratton 84003680 Engine Muffler helps reduce engine exhaust noise while directing exhaust gases away from the engine. It is part of the exhaust system and supports quieter operation of compatible outdoor power equipment. Replacing a worn, damaged, or corroded muffler can help maintain proper exhaust flow and reduce excessive noise during operation. Check your engine mode... https://www.wholetoolbox.com/briggs-stratton-84003680-engine-muffler/84003680.html