GT1
Aston Martin DBR9
Dodge Viper GTSR
Saleen S7R
Chevrolet Corvette C5R
Porsche 911 GT2
Maserati MC12
Ferrari 575 GTC
TVR Cerbera Speed 12
Marcos Mantara LM600
Ford GT

looks good, and this would be all that was needed.
Remove the restrictors, wings and diffusers; allow unlimited size tires, and set weight to displacement with no engine size limit.
That would get peoples attention - quickly.

Bob