Some assumptions were made with the Z3 concerning it's output potential and it's stated factory HP... Also, some experts were consulted. Additionally, a little weight was added because of the excellent transmission ratios (1:1 5th!!), excellent brakes, well balanced handling, factory 16" wheels size, etc.... It's classified about 145lbs more than the 240SX, and about 195lbs more than the Acura... Does that seem unreasonable??? Seems pretty reasonable to me.
Further, the experts we've consulted agree with the weight, and also suggested that the car would likely have difficulty making that weight, as it's a pretty heavy car to start with...
All in all, I think you'll find that it was very fairly classified.
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