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What you may not know about the construction of the '07 Shelby GT 500--and all other Mustangs for that matter--is that these cars go down the same assembly line as the Mazda 6. Moreover, the cars don't go down the line in runs. Instead, Mustangs and Mazdas make their way down the line together at the Auto Alliance International assembly plant. The Shelby engines are assembled by a pair of assembly associates on the Romeo Engine Niche Line.