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Depends what regulations you are under.
According to the 2009 SuperGT regulations, vehicles must maintain a minimum weight of no less than 1,100kg (2425lbs). SuperGT regs require the original production chassis between the wheel centers be unmodified.
If no limit, then I'd imagine you can make the chassis weight as light as.... 1400lbs? (Just a guess) But, I'm talking Ti + C everything.
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