This study aims to design and develop an adaptive car spoiler to reduce drag on the car during the driving journey. The car spoiler has been designed using SolidWorks and simulated and tested by Finite element analysis (FEA) and computational fluid dynamics (CFD). The performance of the proposed design was evaluated with a closed and open drag reduction system (DRS) in addition to the comparison case study. The findings showed that the design experienced low stress and strain during simulation by FEA. The CFD results revealed close DRS generated higher downforce which means that it will allow the car to have more grip when going through corners. For the open DRS, the downforce drops significantly which is exactly what is required for the car to go faster at a straight line. This confirms the better performance with DRS open. The pressure and velocity values are approximately the same for all spoilers. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2025.