Instructions
Turn on your Xbox 360. Sign in with your profile.
Navigate to the "Game Marketplace" menu. Select "Explore Game Content."
Select "Browse."
Select "M." Select "Midnight Club LA" from the list provided.
Select the car pack DLC to download.
Add Microsoft Points to your account. Press "X." Select the denomination of points. Select a credit card or add a new card if one is not available. Select "Confirm Download" to begin the download. The DLC will automatically install to the Xbox 360. The cars will be available in your in-game showroom when selecting a vehicle.