Exhaust manifold for four-cylinder engine

In an exhaust manifold of a four-cylinder engine four cylinders of which line up in order of cylinder #, cylinder #, cylinder # and cylinder #, temperature rise performance of a manifold catalyst improves by shortening a total length of the exhaust manifold while preventing exhaust gas interference between the cylinders. Therefore, an exhaust manifold branch of cylinder # and an exhaust manifold branch of cylinder # in outward sides of the engine that are not fired in succession are made convergent with its convergence angle θ being equal to or below 20 degrees to form a first convergent exhaust manifold branch and an exhaust manifold branch of cylinder # and an exhaust manifold branch of cylinder # 3 between the cylinder # and cylinder # that are not fired in succession are made convergent at a minimum distance having a laterally projected shape to form a second convergent exhaust manifold branch. The first and the second convergent exhaust manifold branches are thereafter convergent at a convergence angle θ from 0 degrees to 20 degrees.