Branching pipes connect a surge tank to an intake manifold of an internal combustion engine. The branching pipes are made such that each gas column of the internal combustion receives a uniform intake volume. This is achieved by either making each branching pipe of the same length, or by adjusting the inside diameters of the branching pipes, thereby creating a flow delay of the intake into the gas columns, resulting in uniform intake volume. The inside diameters of the branching pipes are either made uniformly of a different diameter, or, alternatively, the inside diameters of the branching pipes include throttles for reducing the diameter of the branching pipe at a localized portion. In both cases, a flow delay of the intake into the gas columns is compensated, resulting in a uniform intake volume. The branching pipes of the present invention result in an improved output performance for the internal combustion engine; provide for smooth branching paths; reduce intake resistance; allow the intake manifold to be made compact and light; reduce fuel consumption; improve power performance; allow the internal combustion engine to be made compact; allow easier mounting in automobiles; and allow automobiles to be lighter.