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I poked around on the net for a couple hours one night just out of curiousity and never found anything explaining the letter designations of the 300zx and 240sx... However, seeing as how the 300zx is the Fairlady "Z" and the 240sx is the "S"ilvia (well, based on it, that is), I would say it's a reasonable guess that the "Z" and "S" are holdovers from Fairlady Z and Silvia names. As to what the "X" stands for, I have no clue. But you see it on a fair number of cars, so I wonder if it's just a designation they add to make sound a bit sportier or something.
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