This research paper aims to optimize the intake system’s plenum and intake manifold length. The paper discusses the importance of the precisely calculated intake plenum volume, which significantly impacts the internal combustion engine performance. The design of the plenum, besides the chosen volume should assure the desired airflow quantity and quality through the whole system. 1D simulations do these particular analytic calculations and the CFD tool is used to determine the laminarity of the airflow. The second part of this paper intends to explain the intake pipe, restrictor calculations and why it is crucial for a precisely tuned race engine. Validation of the simulation results with engine test bench measurements and explanation of different engine performance plotting techniques via indication data.