In GT4 it was possible to buy cars from the garage on anyone else's memory card, provided you had earned enough in game credits to pay the full value of the car. It was a useful method to duplicate unique cars in order to keep one pristine unmodified version, and then get another for modding and racing. I'm assuming this isn't possible on GT5 given the nature of the locked saves? but I think I read that you can 'gift' cars - but presumably you lose them in the process? Looking for a way to get the Stealth cars when I eventually get the game (without being ripped off by people selling the preorder codes) but unless GAME massively slash the price of the Signature Edition I don't see a work around yet.