At the concourse portion or bifurcation of the exhaust pipes, a catalytic converter 5 of {HEAD ~ 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 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 { HEAD ~ 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 the common exhaust pipe 4 to { TAIL ~ an outlet } thereof
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