Engine and exhaust structure

An exhaust structure comprising:

• an exhaust pipe including:
• a first exhaust pipe connected to an outlet of a first exhaust port of an engine body;
• and a second exhaust pipe connected to an outlet of a second exhaust port of the engine body;
• and
• a downstream device including a downstream inlet connected to the exhaust pipe,
• wherein the downstream inlet includes a first inlet to which a downstream end of the first exhaust pipe is connected, and a second inlet to which a downstream end of the second exhaust pipe is connected, and
• a cross section of the downstream inlet has a point-symmetric shape around an axis extending along a connection direction of the downstream inlet and the exhaust pipe to allow the downstream device to connect to the exhaust pipe when the downstream device is in both a first posture and a second posture that is rotated 180 degrees from the first posture.

An engine comprising:

• an engine body in which a plurality of cylinders is formed;
• a plurality of exhaust pipes that is connected to the engine body and into which an exhaust gas discharged from each of the cylinders is introduced;
• and
• a downstream device including a downstream inlet to which each of the exhaust pipes is connected,
• wherein the downstream inlet includes an equal or greater number of inlets than a number of the exhaust pipes, the inlets each being connectable to a downstream end of each of the exhaust pipes, and
• the downstream inlet, with the number of inlets being n, has an n-fold symmetric shape around an axis extending along a connection direction of the downstream inlet and the exhaust pipes to allow the downstream device to connect to each of the exhaust pipes when the downstream device is in both a first posture and a second posture that is rotated by an integral multiple of m(=360÷n) degrees from the first posture.