1. A V-type engine, comprising: an engine body including a crankcase configured to rotatably support a crankshaft, and a first and second cylinder banks extending from the crankcase; a first exhaust pipe connected to the first cylinder bank; a second exhaust pipe connected to the second cylinder bank; a merging pipe connected to the first and second exhaust pipes; a first catalyst accommodated in the first exhaust pipe; a second catalyst accommodated in the second exhaust pipe; a muffler detachably connected to the merging pipe, wherein the first catalyst is arranged along an outer surface of the first cylinder bank, and the second catalyst is arranged along an outer surface of the second cylinder bank, wherein provided that an axial direction of the crankshaft is defined as a first direction, the first catalyst is arranged along a surface of the first cylinder bank on one side in the first direction, and the second catalyst is arranged along a surface of the second cylinder bank on the one side in the first direction, wherein provided that a width direction of the engine body is defined as a second direction, an exhaust port is provided on an outside surface of the first and second cylinder banks in the second direction, and the first and second exhaust pipes include: an upstream portion connected to the exhaust port and arranged along the outside surface of the first and second cylinder banks in the second direction; and a downstream portion connected to the upstream portion and arranged along the surface of the first and second cylinder banks on the one side in the first direction, and the first catalyst is accommodated in the downstream portion of the first exhaust pipe, and the second catalyst is accommodated in the downstream portion of the second exhaust pipe.