Ahmed body is a reference body, invented by Ahmad (1984) to predict the structure of flow that passes the cars. It specially was designed to simulate the influence of the back part of the cars. Since I had several CFD analyses on car bodies, I decided to validate my results with this body. I managed to produce the certain structures of the flow that Ahmed had predicted and the amount of error in drag force was less than %10. I used sheer stress transport k- model and RSM model. The result of this experience was a part of a paper I published at ISME2009. I also used it to validate the results of CFD analyses on APADANA and super mileage designs.