I'd actually go for three classes:
GTX: Start with a production shell, then go nuts. Any engine from a manufacturers range is good, reposition it however you like and do whatever you want with your suspension pick up points. I.e. built RACECARS and no whatsoever BoP.
GTO: Closer to production, no waivers of any kind, for cars over 4 litres of displacement
GTU: The counterpart to GTO, for cars under 4 liters.
With a X-class format, guys like BMW can compete for top-GT honors, but everybody will know that these cars have very little in common with the street cars. The O and U classes would be a real test for roadcars.
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