A Friend and i where grinding Amulets and it happens that we were competing as the fastes one too die and got on the master rank arena quest MR Arena 05 Espinas M4* and we both got a time around 14.25 and we were thinking off makin it a speedrun.

You're free to do whatever speedrun you want, speedrun.com boards are not necessary for every meme speedrun that people decide to do however.