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here is an update.
I still haven't been able to get a model of my car that I can use in OpenFOAM (I did find one for GTA IV but I can't convert it using blender) . I did however find a more accurate model of the w124 car and plugged it in and the CD dropped from 0.51 to 0.46 . I also had a major impact on the way the air flowed around the rear of the model. I can conclude from this 10% drag drop that accuracy of your model counts!
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