Overkill is often very subjective and a matter of taste. There is one category though that any supercar enthusiast should see as a definite no-go: replicas.
These Ferrari replicas of the legendary F40 and Testarossa are all based on inferior sports cars or sometimes even sedans. The builders often created custom body panels and fake badges to replicate the original, in general without success. Of course proper and well build replicas of crashed or lost supercars of past times deserve credits, but they are in a different league compared to the replicas we have seen in our overkill category.