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With the advancements of trends in Formula1 it has been quite clear that aerodynamics plays one of the most vital roles in the performance of the car. A typical aerodynamic package of a Formula1 car consists of rear wings, front wings and an under tray diffuser. This research paper is concerned with the development of an efficient under tray diffuser. The under tray diffuser is a shaped section of the car underbody to improve the aerodynamic properties of the car. Mainly it is used to generate maximum down force corresponding to minimum drag. Several studies have been carried out in recent decades to improve the vehicle performance, aerodynamic properties in particular. The present work deals with studying the performance of under tray diffuser by varying the geometric properties of the under tray diffuser such as Inlet angle, Outlet angle corresponding to varying ground clearances.