Exhaust system of automotive vehicle

An automotive vehicle having a vehicle body, comprising:

• a muffler disposed beneath the vehicle body to attenuate exhaust noise, said muffler being formed with a front end face facing toward the front of the vehicle and a rear end face facing toward the rear of the vehicle, the longitudinal axis of said muffler being parallel with the longitudinal axis of the vehicle body, said muffler having therein first and second partition walls, said first partition wall being located nearer to the front end face than the second partition wall, a front resonance chamber being defined by the first partition wall, an expansion chamber being defined between the first and second partition walls, a rear expansion chamber being defined by the second partition wall said second partition wall being provided with passage means interconnecting said expansion chambers, and conduit means for connecting said front resonance chamber to said rear expansion chamber;
• an exhaust pipe for introducing therethrough exhaust gases into said muffler, inserted into said muffler through the front end face of said muffler, an end portion of said exhaust pipe opening to the rear chamber of said muffler;
• a tail pipe for discharging therethrough the exhaust gases out of said muffler, having a first end portion inserted through the front end face into said muffler and opening to the expansion chamber of said muffler, a curved portion integrally connected with the first end portion through a first straight portion which is located within the front chamber and parallel with the longitudinal axis of said muffler, and a second end portion located rearward of the rear end face of said muffler, the second end portion being integrally connected with the curved portion through a second straight portion parallel with the first straight portion, the second end portion being formed with an exhaust gas outlet through which the exhaust gases are discharged into the atmosphere.