Exhaust gas apparatus of an internal combustion engine

An exhaust gas apparatus, comprising

• an exhaust gas pipe having at one end portion an upstream opened end connected to a sound deadening device positioned at an upstream side in a discharging direction of exhaust gas discharged from an internal combustion engine, and at the other end portion a downstream opened end through which the exhaust gas is discharged to the atmosphere;
• and
• a plate formed with an opened portion and a closed portion closing the cross section of the exhaust gas pipe, and provided at the downstream opened end in opposing relationship with the discharging direction of the exhaust gas, wherein
• the exhaust gas pipe has at a peripheral wall thereof a through bore passing through an outer peripheral portion and an inner peripheral portion of the exhaust gas pipe,
• the through bore is spaced upstream of the plate in the exhaust gas pipe by a predetermined distance with respect to the inner diameter of the exhaust gas pipe, so that an opened end reflection caused by the downstream opened end is positioned at the plate, and
• the through bore is empty and open to an outside of the exhaust gas pipe.