While there is no official game for the Sony PSP, the " Forza Horizon PSP ISO
You will often find updated car lists including modern supercars (like the McLaren Senna or Bugatti Chiron) that were never in original PSP games.
If you are looking to download this, be careful. The "updated" tag is often used to bait clicks on shady sites. However, if you can find the legitimate Total Conversion mods (often available as patch files to be applied to a Need for Speed ISO), you will find a genuinely impressive piece of fan art.