An engine (6, 206) comprising: a cylinder block including a plurality of cylinders disposed along a V-shaped line; a pair of exhaust manifolds disposed inside the V-shaped line, each of the pair of exhaust manifolds including a first passage; and an exhaust pipe (26, 226) disposed inside the V-shaped line, the exhaust pipe including a connection passage (50, 250); wherein each of the first passages includes: a plurality of first inflow ports into which exhaust gases from the plurality of cylinders flow; a first collecting portion at which exhaust gases that have flowed into the plurality of first inflow ports are collected; and a first exhaust port from which exhaust gases collected by the first collecting portion are discharged; the connection passage (50, 250) includes: a pair of intermediate inflow ports that are connected to the first exhaust ports of the pair of exhaust manifolds, respectively, and into which exhaust gases from the first exhaust ports flow; and at least one intermediate exhaust port from which exhaust gases that have flowed into the pair of intermediate inflow ports are discharged; and a catalyst housing portion disposed between the pair of intermediate inflow ports and the at least one intermediate exhaust port; an upstream portion (50c, 250c) through which the pair of intermediate inflow ports and the catalyst housing portion are connected; and a downstream portion (50e, 250e) through which the catalyst housing portion and the at least one intermediate exhaust port are connected; the engine further comprises a catalyst disposed in the catalyst housing portion; and characterized in that the exhaust pipe (26, 226) includes: a fixing portion fixed to the exhaust manifold, the fixing portion including either one of the intermediate inflow port and the intermediate exhaust port; and a floating portion movably connected to the exhaust manifold, the floating portion including either one of the intermediate inflow port and the intermediate exhaust port. a cylinder block including a plurality of cylinders disposed along a V-shaped line; a pair of exhaust manifolds disposed inside the V-shaped line, each of the pair of exhaust manifolds including a first passage; and an exhaust pipe (26, 226) disposed inside the V-shaped line, the exhaust pipe including a connection passage (50, 250); wherein each of the first passages includes: a plurality of first inflow ports into which exhaust gases from the plurality of cylinders flow; a first collecting portion at which exhaust gases that have flowed into the plurality of first inflow ports are collected; and a first exhaust port from which exhaust gases collected by the first collecting portion are discharged; a plurality of first inflow ports into which exhaust gases from the plurality of cylinders flow; a first collecting portion at which exhaust gases that have flowed into the plurality of first inflow ports are collected; and a first exhaust port from which exhaust gases collected by the first collecting portion are discharged; the connection passage (50, 250) includes: a pair of intermediate inflow ports that are connected to the first exhaust ports of the pair of exhaust manifolds, respectively, and into which exhaust gases from the first exhaust ports flow; and at least one intermediate exhaust port from which exhaust gases that have flowed into the pair of intermediate inflow ports are discharged; and a pair of intermediate inflow ports that are connected to the first exhaust ports of the pair of exhaust manifolds, respectively, and into which exhaust gases from the first exhaust ports flow; and at least one intermediate exhaust port from which exhaust gases that have flowed into the pair of intermediate inflow ports are discharged; and a catalyst housing portion disposed between the pair of intermediate inflow ports and the at least one intermediate exhaust port; an upstream portion (50c, 250c) through which the pair of intermediate inflow ports and the catalyst housing portion are connected; and a downstream portion (50e, 250e) through which the catalyst housing portion and the at least one intermediate exhaust port are connected; the engine further comprises a catalyst disposed in the catalyst housing portion; and characterized in that the exhaust pipe (26, 226) includes: a fixing portion fixed to the exhaust manifold, the fixing portion including either one of the intermediate inflow port and the intermediate exhaust port; and a floating portion movably connected to the exhaust manifold, the floating portion including either one of the intermediate inflow port and the intermediate exhaust port. a fixing portion fixed to the exhaust manifold, the fixing portion including either one of the intermediate inflow port and the intermediate exhaust port; and a floating portion movably connected to the exhaust manifold, the floating portion including either one of the intermediate inflow port and the intermediate exhaust port.