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As the nice lady from Roush marketing explained, they take perfectly good Mustangs that have only recently been completed at the Flat Rock assembly plant and start taking parts off that had been just put on. Some get replaced with Roush specific parts, others, like the front and rear fascias are modified to bear Roush styling. In this video we see the start of the actual build process with an unmodified Mustang being driven into the first assembly station.