Briggs & Stratton 494585 Lo-Tone Muffler For 4 HP (10 CID) and 5 HP Horizontal and Vertical Engines Genuine OEM Briggs & Stratton Part The muffler assembly is complete including the adapters, the gasket, and mounting hardware This part replaces old part numbers: 393615, 493936, 297274 and 297506 Fits various Briggs & Stratton engines