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I don't have 90s/00s JGTC tech regulations.
But, in 2003, JAF-GT500 tech regulations were greatly revised.
*It was accepted that the front and behind of the monocoque could be pipe framed, and you can freely decide suspension style (inbord suspension is allowed).
*Flat bottom is obligatory for underfloor shape.
*You can freely decide where to mount the transmission (transaxle gearboxes are allowed).
*You can freely rotate the engine position as long as it is within the range of the engine room (NSX can use vertical engine).
Therefore, earlier JGTG cars were very similar to production cars.
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