Authentic repacks from trusted scene groups (like FitGirl, Xatab, or DODI) do exist for console games, but they require significant technical know-how. You will not find a simple “install and play” version of FH2 on PC like you would for Forza Horizon 5 .
Performance depends heavily on the emulator's maturity and your hardware. How to Get the Best Experience Forza Horizon 2 Highly Compressed For Pc