At the concourse portion or bifurcation of the exhaust pipes, 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 the end of {HEAD ~ the common exhaust pipe} 4 to {TAIL ~ an outlet} thereof 
At the concourse portion or bifurcation of the exhaust pipes , 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 the end of { HEAD ~ the common exhaust pipe } 4 to { TAIL ~ an outlet } thereof
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