Perhaps the ABS discussion should move to the ABS spin-off thread
Regarding real cars we have (in no particular order)
BF1 FBM MRT VWS RAC
The rest of the cars are based on real cars (some more loosely than others)
XR - Mitsubishi Starion
XF - Citroen AX
UF - Classic Mini
FZ - Porsche 911 (almost identical in specs to a specific version)
LX - Caterham
FX - Opel/Vauxhall Astra Coupe
RB4 - probably the hardest to match, general consensus is a combination of Toyota Celica/Toyota Supra/Mitsubishi Eclipse/Mitsubishi 3000GT
The other SS cars are based on real championships, IIRC F3000 and something else - It says exactly which ones in the forum somewhere
/off topic