Abstract: A method of manufacturing a muffler for an automotive vehicle includes providing an interior subassembly including spaced apart end plates and flow tubes extending generally perpendicular to the end plates. A leading edge of a metal sheet is clamped against the interior subassembly and the sheet is welded proximal the leading edge, to the interior subassembly. The interior subassembly is rotated while maintaining tension on the sheet, thereby causing the sheet to wrap around the interior subassembly as the interior subassembly rotates and the sheet is welded at an intermediate location to the interior subassembly. The rotating of the interior subassembly is repeated and the sheet is welded proximal a trailing edge thereof to one of the interior subassembly and an underlayer of the sheet. The subassembly is then rotated and the sheet is continuous seem welded to the end plates.