The game is playable on the emulator. Save files for the 360 work directly. Simply place the 4D5309C2 folder in Documents/Xenia/content/ . No re-signing required on PC.
If you have a hardware-modded console:
A 100% complete save game for Forza Horizon 2 on Xbox 360 typically includes: Forza Horizon 2 Xbox 360 Save Game 100 Complete