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An exhaust device for internal combustion engines, comprising in combination a toroidal manifold which is transversely of substantially round cross section, a plurality of flared mouth pipes opening individually from said cylinders in a common direction substantially parallel to the toroidal axis and connecting upon the exterior of the manifold tangentially into the interior of said manifold, an engine cowling, and a plurality of flared mouth outlet pipes opening tangentially from the interior of said manifold and tangentially to the engine cowling in a common direction substantially parallel to said axis into the open air.