Atari today announced that two free downloadable cars, the Audi RS4 Quattro and the Nissan Skyline GT-R34, will be available for free next week, for the Xbox 360 version of Test Drive Unlimited. Test Drive Unlimited offers more than 125 licensed vehicles from exclusive manufacturers including Lamborghini, Ducati, Aston Martin, Mercedes, Saleen, Shelby, and Jaguar. It will also feature more than 1000 miles of Hawaiian roads, and realistic cars and bikes. Test Drive Unlimited will be released by Atari in October, for PC, PS2 and PSP.