Exhaust apparatus for internal combustion engine

An exhaust apparatus for an internal combustion engine, comprising:

• a plurality of exhaust pipes extending independently from each other individually from a plurality of exhaust ports;
• and
• a bypass section that communicates the exhaust pipes with each other in a region wherein the exhaust pipes are independent of each other;
• the bypass section being opened or closed to control an exhaust characteristic, the bypass section comprising:
• a plurality of bypass paths;
• a bypass joining section wherein the bypass paths are joined to be adjacent with each other;
• a single on-off valve configured to open and close the bypass paths simultaneously, said single on-off valve being positioned at the bypass joining section;
• a single actuator operatively connected to the single on-off valve for selectively driving the on-off valve to an open and a closed position;
• a partition inner wall formed inside of the bypass joining section wherein the bypass paths are formed inside of the bypass joining section;
• and
• the on-off valve includes flap portions in the form of a plate that correspond to a shape of a cross section of the bypass paths and open and close the bypass paths and a single rotational shaft for rotating the flap portions, and the rotational shaft is provided to extend through the partition inner wall in a direction crossing with the partition inner wall.