The present invention relates to an engine plumbing flow rate increase device, which induces exhaust gas to flow round to be discharged to increase a discharge flow rate and smoothly discharge the exhaust gas. According to the present invention, the engine plumbing flow rate increase device comprises: a flow rate increase pipe body (100) coupled to an end portion of an exhaust pipe (1); and a flow rate round current pipe body (110) formed in the flow rate increase pipe body (100). Therefore, according to the present invention, the engine plumbing flow rate increase device formed with the flow rate increase pipe body coupled to an end portion of the exhaust pipe and the flow rate round current pipe body formed in the flow rate increase pipe body is provided to smoothly discharge exhaust gas by round current movement for fuel efficiency of an engine to be improved by decreasing exhaust resistance.
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