Abstract: An intake manifold for use with a downdraft carburetor of a motorcycle engine having a plurality of cylinders comprising a plenum to receive a mixture of fuel and air from the venturi of the downdraft carburetor, the plenum being in fluid communication with the plurality of cylinders of the motorcycle engine through a corresponding plurality of fuel air feed tubes, each fuel air feed tube including a transition section and a supply section coupled to a corresponding manifold outlet port and a corresponding feed tube outlet port respectively to feed the mixture of fuel and air from the downdraft carburetor to the cylinders of the motorcycle engine.