I'm not aware of the regulations of the GTR Evo cars, since they're all fictive liveries, do not represent any real racing series, and mostly are Race 07 counterparts of GTR2 cars. By following your logic, you're claiming that 2000s FIA GT cars, FIA historic GT cars of the 60s and 70s and even a BMW M3 E90 road car use the same regulations. That's right, UndertrayParams' spring and damper rates are also identical to GTR2's and GT Legends' in SimBin's BMW M3 Challenge game.Because those sims are representing different series, with different specs and regulations for the cars?
Like I mentioned before, I just brought up a matter for other users to investigate. I'm not interested in the discussion you're trying to bring about SimBin doing everything right for some obscure and unknown regulation. I've written enough info already for users to understand what to do about it, I have nothing more to add to this topic.