An exhaust system for an internal combustion engine having a plurality of cylinders is disclosed. The exhaust system comprises a plurality of exhaust branch passages, an intermediate exhaust pipe section, a partition plate and a downstream pipe section. Each exhaust branch passage is in communication with a respective cylinder. The intermediate exhaust pipe section forms a passage that is in communication with the exhaust branch passages. The partition plate is provided in the intermediate passage and divides the intermediate passage into first and second flow paths. The partition plate further includes a projection positioned on a first surface thereof that is oriented so as to be generally perpendicular to the direction of exhaust flow. The partition plate is disposed within the intermediate passage so as to position the projection in the first flow path.