Road vehicle with an internal combustion engine and provided with an exhaust noise transmission device

A road vehicle (1) comprising:

• a passenger compartment (5);
• an internal combustion engine (4) provided with at least one exhaust duct (13), which originates from an exhaust manifold (8) and has at least one exhaust gas treatment device (17);
• and
• an exhaust noise transmission device (21) provided with at least one transmission duct (22), which originates from the exhaust duct (13), and with a symposer device (23), which is arranged on the inside of the transmission duct (22), is pneumatically insulating and is acoustically permeable;
• wherein an inlet (24) of the transmission duct (22) is arranged between the exhaust manifold (8) and the exhaust gas treatment device (17), hence upstream of the exhaust gas treatment device (17);
• the road vehicle (1) being characterized in that:
• the symposer device (23) is at least partially made of plastic material;
• and
• the transmission duct (22) comprises an initial metal part (26), which originates from the exhaust duct (13), and a plastic insulating part (27), which is arranged in series with the initial part (26) immediately upstream of the symposer device (23).