This project deals with the improvement of the performance and to achieve the even distribution of flow at each cylinder, to select the best turbulence model for the analysis of intake manifold using computational fluid dynamics, to achieve the maximum mass flow rate through the runners. To achieve the even flow of distribution and improve the volumetric efficiency, we divided his analysis into four different parts. In each part, a different iteration of inlet manifold used in Maruti Gypsy’s G13BB engine is used. In this analysis, plenum size is only changed in small values to show the effects of the shape of runners on output. Dividing the work into four different parts provide the greater refinement in the result. Runner shape is determined by the operating conditions of the engine assembly in which the inlet manifold is used. The intake runner diameter influences the point at which peak power is reached while the intake runner length will influence the amount of power available at high and low RPM. To find the best results, we perform the experiments in Ansys Fluent for possible designs and find the effect of curved and branched runners were providing higher volumetric efficiency and even flow of distribution to each cylinder. For designing final intake manifold we select the best design from all four parts and perform the experiment using computational fluid dynamics software Ansys Fluent. This project work brings the design concept and analysis method of “DESIGN AND ANALYSIS OF VELOCITY PROFILE OF AIR IN ENGINE INLET MANIFOLD”.