Off the top of my head:
Current ALMS P1 (R1) cars include the following:
Aston Martin Lola - #007 ONLY.
- Stock
Audi R15 TDi - #2 ONLY.
- Stock
Audi R10 TDi - #2 and #8 ONLY.
- Stock
Peugeot 908 - #8 and #9 ONLY.
- Stock
Acura ARX-02a - #66 ONLY.
- Stock
optional P2 cars...
Mazda Lola B06
Acura ARX-01b
Porsche RS Spyder
Current ALMS GT2 (R3) cars include:
Porsche GT3 RS-R (997) - #45 and #80 only.
- Remove restrictor plates ONLY. Stock brakes.
Panoz Esperante GTLM - #51 and #81 only.
- MUST REMAIN STOCK
Ferrari F430GT - #71, #90, #62 only.
- mods pending
BMW M3 GT2 (E92) - #92 only.
- mods pending
Dodge Viper Competition Coupe - #11 only.
- mods pending
Now, MOST of those cars in the game have the paint scheme from the 2008 or 2009 season. I've got a few additional liveries for my Porsche, since the #45 Flying Lizard car is the default paint and someone may want to use it. There's also a few liveries out there for the #66 Acura ARX-02a, such as Patron/Highcroft Racing.
Now as far as where one would start...most of the time, we allow people to pick and choose what class they want to run. Some folks actually have an easier time driving prototypes since they turn on a dime and have ridiculous amounts of grip (with proper throttle control). Regardless of who races what, we will always have the field split with 4 prototypes and 4 GT cars, just to ensure the challenge.