My guess is these are all GT350's at various timing/tunes to get things set for the final release on power and torque and emissions figures before they actually hit the ground in the showrooms. The 0-60, stopping distances, lateral G's. Basically buttoning down the numbers before going to the consumers. The front fenders and side skirts would all indicate they are the same car. The rear wing is the Steeda tru-downforce racing wing. Which is good to know since sits well on the S550.
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