| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an exhaust manifold capable of improving the detection accuracy of an oxygen sensor and making exhaust gas suitably flow in an exhaust emission control device. Ž<P>SOLUTION: This exhaust manifold is provided with a plurality of branch pipes 11a, 11b, 11c, 11d guiding exhaust gas discharged from cylinders, and a collecting pipe 12 collecting downstream side ends of the plurality of branch pipes 11a, 11b, 11c, 11d and including a drawn portion 25 formed by reducing radial direction dimension. An air fuel ratio sensor 15 is provided at a downstream side of a deepest draw inside diameter D2 which is the smallest inner diameter of the drawn part 25 in the collecting pipe 12. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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