MS7XWDC has uploaded a Gran Turismo 5 Prologue game save for the European (PAL) region which contains the Ferrari F1 F2007 car unlocked. We cannot test it since we do not have the game yet. Use caution.
Direct download link.
FileFront.com download link.
[Source: Sony PS3 Modding - Homebrew, Upgrades, Mods, and Hacks]