The exhaust system is one of the most important systems in automotive engines and functions to collect the exhaust gases from the cylinders, remove dangerous elements, reduce the degree of noise, and release the purified exhaust gases away from the vehicle’s occupants at an appropriate location. The paper presents a study on the parameter and design of the manifold toward the performance of the engine and its improvement of standard manifolds. This study begins with the development of design and modeling of the manifold. The drafting and sketching have been carried out based on the parameters produced by the “Gap Study” method using a literature review and generated through the Taguchi method, Minitab. The process continued with designing the manifold by using CAD through Solidworks applications and finally produced a schematic technical drawing for preparation during the second stages. The simulation has been conducted through all the design stages and the result analyzed the velocity profile of the inlet, middle, and outlet. A comparison was conducted to find out the best manifold between the three models.