First, you can use emulator, it's fine, the default time is the IGT, like this, we can use PS2, PS3, emu, or wathever, it's always legit, even if the RTA is not exactly the same between the platforms.

You can use the emlator PCSX2, it's a good one. You have one thing to do on the emu for playing the game without bugs (ghosts don't appear, and a door in the beginning refuse to trigger if i remember) : You have to go to "Configuration", then "video", then "settings of plugin", and then, you have to change the part called Renderer to "Direct3D11 (Software)", and not hardware. And that's it, you can play to the game :) . If you using a PAL copy, be sure you're running in 60Hz (there is an option for it in the menu) if you want to speedrun the game, the 50Hz is slower and not valid.