(10) connected to an air cleaner, and an exhaust pipe (10) fixed to the intake manifold, wherein the intake pipe (10) is fixed to the intake manifold (30) provided with a flexible pipe (20) for connecting the ends of both pipes and an actuating part (40) provided outside the variable bending pipe (30) There is an effect that the output of the engine is improved by adjusting the amount of air sucked.
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