Ann Xbox Live account is required for this exploit. First, go to the Game Marketplace, select to find PGR3 Add Ons, and find a free Aston Martin V8 Vantage for download. Download it and, when it's finished downloading, leave the marketplace and begin the game. Now Go to Solo Career and enter your current Garage. Select "Buy cars" and buy The Aston Martin V8 Vantage. Since the car is free, you can repeatedly buy it and fill every garage until you get to Tokyo Two, the last garage possible.