Atari has released the free Launch Pack which contains two new cars for you to buy in the game.

Test Drive Unlimited screenshot

The Launch Pack, which is around 20MB in size, contains two new cars: the Audi RS4 Quattro Saloon and the Nissan Skyline GTR R34. Although you'll need to buy the cars in the game, they are free to download.

Test Driver Unlimited owners in North America can also get their hands on the McLaren F1 LM and Pagani Zonda C12S Roadster. Atari has implemented a referral system in the US, rewarding you and a mate with the free cars by simply finding a unique code in the game's manual and entering the details here.