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TUNABLE, UPGRADABLE CARS (you can buy them in Career Mode, shows up in "Stock" for Quick Race)
The following will all be unlocked once you've completed Career Mode (they are gradually unlocked as you go through it, by winning races or territories, and a couple reserved for when you beat the last boss):
Mazda RX-8 Tuner 1
Chevrolet Camaro SS Muscle 1
Mazda Mazdaspeed3 Tuner 1
Chrysler 300C Hemi SRT8 Muscle 1
Alfa Romeo Brera Exotic 1
Mercedes-Benz CLK 500 Exotic 1
Mitsubishi Eclipse GT Tuner 2
Volkswagen Golf R32 Tuner 2
Vauxhall Monaro VXR Muscle 2
Lotus Elise Exotic 2
Renault Clio V6 Tuner 2
Ford Mustang GT Muscle 2
Mazda RX-7 Tuner 2
Dodge Charger SRT8 Muscle 2
Porsche Cayman S Exotic 2
Dodge Charger R/T Muscle 2
Aston Martin DB9 Exotic 2
Mercedes-Benz SL65 AMG Exotic 2
Nissan 350Z Tuner 3
Subaru Impreza WRX STi Tuner 3
Toyota Supra Tuner 3
Mitsubishi Lancer Evolution IX MR-edition Tuner 3
Ford Shelby GT500 (67) Muscle 3
Nissan Skyline GT-R R34 Tuner 3
Plymouth Hemi Cuda Muscle 3
Dodge Challenger Concept Muscle 3
Dodge Viper SRT-10 Muscle 3
Lamborghini Gallardo Exotic 3
Chevrolet Corvette Z06 Muscle 3
Ford GT Exotic 3
Lamborghini Murciélago Exotic 3
Porsche Carrera GT Exotic 3
Mercedes-Benz SLR McLaren Exotic 3
Only included in Collector's Edition, must be unlocked by getting Gold in their respective Challenge Mode events:
Nissan 240 SX Tuner 1
Jaguar XK Exotic 2
I have no idea how to unlock these, do tell if you know (other than with hacking / a trainer of course!) -- they would be rather useful as these too are upgradeable cars you could add to your garage:
Dodge Challenger 1971* Muscle 2
Infiniti G35 Tuner 3
Porsche 911 Turbo Exotic 3
*I suppose the Dodge Challanger may be automatically available for those who bought the EA Downloader version of the game.
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CUSTOM/BONUS CARS -- these cannot be bought in Career Mode, added to My Cars or customized in any way, but most of them come in two versions you could choose from: one stock and one with a "riced up" look:
Finish Career Mode:
Audi Le Mans quattro Exotic 3
Available from the start for Collector's Edition owners (for Quick Races or Online only, obviously):
Koenigsegg CCX Exotic 3
Chevrolet Camaro Concept Muscle 3
I guess this one is available from the start for EA Downloader preorder users (I'm not one so I don't know):
Pagani Zonda F Exotic 3
These could be unlocked through Reward Cards, single player:
Lamborghini Murciélago LP640 Exotic 3
BMW M3 GTR Exotic 3
Mitsubishi Eclipse GSX 1999 Tuner 2
Chevrolet Chevelle SS Muscle 1
These could be unlocked through Online-only Reward Cards:
Pontiac GTO Muscle 2
Porsche 911 GT3 RS Exotic 3
Toyota MR2 Tuner 2
Unlocked when you reach Online XP Level 1:
Lexus IS300 Tuner 1
Unlocked when you reach Online XP Level 8:
Plymouth Road Runner Muscle 2
Unlocked when you reach Online XP Level 50:
Lotus Europa S Exotic 2
I don't know when these are unlocked -- but I'd guess somewhere at Online XP Level 11-49 (I'm only lvl10 at the moment..):
Toyota Corolla GT-S Tuner 2
Ford Shelby GT500 (07) Muscle 3
...and that's all the cars as far as I'm aware, other than the Police and gimmick vehicles (Firetruck, etc.).