At the concourse portion or bifurcation of the exhaust pipes, {HEAD ~ a catalytic converter} 5 of the present invention is provided, connecting each end of the exhaust pipes 2 and 3 to an inlet of the catalytic converter and connecting {TAIL ~ the end} of the common exhaust pipe 4 to an outlet thereof 
At the concourse portion or bifurcation of the exhaust pipes , { HEAD ~ a catalytic converter } 5 of the present invention is provided , connecting each end of the exhaust pipes 2 and 3 to an inlet of the catalytic converter and connecting { TAIL ~ the end } of the common exhaust pipe 4 to an outlet thereof
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