Originally posted by The359
If you want to get technical, the only confirmed manufacturers are:
Acura
Amuse
Alfa Romeo
Alpine
ASL
Aston Martin
Audi
Autobianchi
BMW
Cadillac
Chevrolet
Chrysler
Citroen
Daihatsu
Dodge
Dome
Fiat
Ford
Ginetta
Honda
Hyundai
Isuzu
Jaguar
Lancia
Lister
Lotus
Mazda
McLaren
Mercedes-Benz
Mini
Mitsubishi
Nissan
Opel/Vauxhall
Pagani
Panoz
Pescarolo
Peugeot
Plymouth
Pontiac
Renault
Ruf
Saleen
Shelby
Subaru
Suzuki
Toyota
TVR
Volkswagen
The rest are still all maybes, although most are likely to be in the game.