I have just uploaded a file rar in which you can find very good times from legendary players of the game and mines (melwin96 is me).

You can put this ghosts in this directory: PSP/SAVEDATA --> Make sure to connect your PSP with a HDMI cable to a Computer

If you open the PARAM.SFO you can see the track, time and the player who got the time

Good luck to beat all of them =)