It stands to reason that incorrect exhaust placement would hurt a car's aerodynamics in the same way that it would hurt a motorcycle's aero.
That being said, cars tend to have a lot more frontal area than motorcycles. Thus, side disturbances, like incorrect exhaust placement, would not be as noticeable as for motorcycles.
However, it may be beneficial to move the exhaust on a car such that the exhaust could take advantage of the low-pressure wake. Could be why so many cars nowadays have exhaust pipes arranged as they are.
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