Cars

This is the complete list of cars, including any DLC packages and any pre-tuned giveaways

Bonus Cars
As far as I know all this cars a given out as stock, with no tuning or upgrades and should be considered the same as their counterparts.

Exclusive Preorder Cars: 2009 BMW Motorsport Walmart M5 E60 2009 BMW Motorsport GameStop M5 E60 2009 BMW Motorsport GAME M3 E92 2009 BMW Motorsport MicroMania M5 E60 2008 Mitsubishi GameStation Lancer Evolution X GSR 2010 Audi R8 5.2 Community Edition

Other: 2008 Audi Zune A4 Touring Car - This car was given away for submitting your Top 10 for the Ultimate Driving Playlist

DLC
Motorsports Legends Car and Track Pack - Available on release Available for free when the game was released, contains 10 classic cars along with 2 test locations - Sidewinder and Benchmark. Hyundai Genesis Pack - Nov 17th A free DLC pack containing three different versions of the Hyundai Genesis Coupe. As well as an additional Genesis specific event for the career mode. Hot Holidays Car Pack - Dec 8th 400 Microsoft points. The first full DLC pack will contain 10 cars including the Ferrari 458 Italia and the 2010 Audi S4. Next DLC - Jan 12th The next DLC was announced by Microsoft to release on Jan 12th 2010.