An article in "Road & Track" on the real-life Mach 5 car from the upcoming Speed Racer film has sparked rumors that the Mach 5 itself could appear in Gran Turismo 5. Much of the speculation revolves around the end of the aforementioned article:
"Special thanks to... Polyphony Digital Inc. for creating a virtual simulation of the Mach 5 that we used for our performance tests."
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