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Even if the Mustang matched the M3 for performance, I think the biggest difference would be durability; how long can the Mustang withstand hard use before something wears out or breaks. We already know that the M3 in general has very good durability over many many miles of both road and track use. I think this is why the M3 costs so much more. It is one thing to produce a fast car, it is another to make it durable.
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