Intercooler front pipe and air inlet manifold with same

The invention discloses an intercooler front pipe and an air inlet manifold with the same. The front pipe comprises a first pipe and a second pipe which are communicated with each other, wherein the area of the radial section of the first pipe is constant basically, an air outlet of the second pipe is a rectangle basically, the area of a first section of the second pipe diminishes quickly and then slowly in the air flowing direction, and the first section is perpendicular to the long side of the air outlet of the second pipe and perpendicular to the plane where the air outlet of the second pipe is positioned. By changing sectional area of the pipe, uniform distribution of air flow in the intercooler front pipe can be achieved, uniformity of front air flow of the intercooler is ensured, and air inflation efficiency and utilization efficiency of the intercooler are increased. The problem of limit on structure improvement on the air inlet manifold caused by introduction of a spoiler or protrusions is avoided, air inlet uniformity of the air inlet manifold with the intercooler front pipe is improved, and performance of an engine is improved.