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This all boils down to the fact that FIA GT1 cars don't have as much downforce as modern GT500's, despite their increased horsepower, faster top speeds and low amount of weight.For purposes of mainly me justifying the 2005 YellowHat Supra and 2006 Xanavi Z into Gr.2, you also have the case of why the Maserati MC12 (in 2006) and Aston Martin DBR9 (in 2009) both failed as GT500 cars. As explained here:
This is the reason why the Aston Martin DBR9 is among the strongest Gr. 3 cars (stock), as FIA GT1-style cars are said to be the top of the food chain in the Gr. 3 category, that is, before BoP is even applied. But even then, you'll never find the Aston Martin DBR9 or the shorttail McLaren F1 GTR attempting to catch up with like say, the 2008 Nissan GT-R GT500.
But even then, the prototype-style longtail GT1's from the late-1990s, as with the Mercedes-AMG CLK-LM and McLaren F1 GTR longtail cars in GT7 are almost equal, if not, faster than the GT500's (heck, the McLaren F1 GTR longtail even races as a GT500).
What would be interesting though would be the possibility of having IMSA GT/GTO/GTX, Group 5 or even SCCA Trans-Am in Gr. 2.