A multi-cylinder internal combustion engine comprising at least one manifold (5a, 5b) for receiving exhausts from the multi-cylindrical internal combustion engine, wherein the manifold (5a, 5b) comprises at least three branch lines (2a 1-4, 2b 1-4), each of which is adapted to receive exhausts from one of the internal combustion engine's cylinders (c 1-8), and a riser (4a, 4b) adapted to lead exhausts in a predetermined direction, and inlet openings (3a 1-4, 3b 1-4) in various positions located downstream in the riser (4a, 4b) in order to receive exhausts from the respective branch lines (2a 1-4, 2b 1-4), wherein the internal combustion engine has such a firing order that the riser (4a, 4b) receives exhausts from two cylinders (c 2, c 4; c 7, c 8) during an overlapping stage, simultaneously via an inlet opening arranged upstream (3a 2, 3b 3) and from an inlet opening arranged downstream (3a 4, 3b 4) in the riser (4a, 4b), and wherein the internal combustion engine has such a firing order that the riser already receives an existing exhaust flow, via the inlet opening (3a 4) arranged downstream, at a time when an initial exhaust flow is received in the riser via the inlet opening (3a 2) arranged upstream, characterised in that the riser comprises a flow passage with a substantially constant cross sectional area, except in one area located in a position in connection with the inlet opening arranged downstream (3a 4) of the two inlet openings (3a 2, 3a 4), which receive exhausts simultaneously, wherein said area is located in a position immediately upstream of the inlet opening arranged downstream (3a 4), wherein said area has a successively subsiding cross sectional area, from an inlet (A 1) up to an outlet (A 2) to facilitate the receipt and the flow of exhausts in the predetermined direction in the riser on occasions when the two inlet openings (3a 2, 3a 4) receive exhausts simultaneously, wherein the riser comprises a first wall side (4a1), comprising said inlet openings (3a1-4) and a second opposite wall side (4a2), which is arranged on an opposite side of said inlet openings (3a1-4), wherein the first wall side (4a1) has a gradient, such that a distance between the first wall side (4a1) and the second wall side (4a2) subsides continuously and linearly from the inlet to the outlet in the area. the internal combustion engine has such a firing order that the riser (4a, 4b) receives exhausts from two cylinders (c 2, c 4; c 7, c 8) during an overlapping stage, simultaneously via an inlet opening arranged upstream (3a 2, 3b 3) and from an inlet opening arranged downstream (3a 4, 3b 4) in the riser (4a, 4b), and wherein the internal combustion engine has such a firing order that the riser already receives an existing exhaust flow, via the inlet opening (3a 4) arranged downstream, at a time when an initial exhaust flow is received in the riser via the inlet opening (3a 2) arranged upstream, characterised in that the riser comprises a flow passage with a substantially constant cross sectional area, except in one area located in a position in connection with the inlet opening arranged downstream (3a 4) of the two inlet openings (3a 2, 3a 4), which receive exhausts simultaneously, wherein said area is located in a position immediately upstream of the inlet opening arranged downstream (3a 4), wherein said area has a successively subsiding cross sectional area, from an inlet (A 1) up to an outlet (A 2) to facilitate the receipt and the flow of exhausts in the predetermined direction in the riser on occasions when the two inlet openings (3a 2, 3a 4) receive exhausts simultaneously, wherein the riser comprises a first wall side (4a1), comprising said inlet openings (3a1-4) and a second opposite wall side (4a2), which is arranged on an opposite side of said inlet openings (3a1-4), wherein the first wall side (4a1) has a gradient, such that a distance between the first wall side (4a1) and the second wall side (4a2) subsides continuously and linearly from the inlet to the outlet in the area.