I'm thinking of potentially ruining the relationship between my mother and her sister
What is your problem with your family? I'm really curious why you want to do this.
Yes, my aunt is too noisy and it bothers my mother.
Even though their relationship can be complicated you shouldn't interfere. It might make things worse and they won't thank you for it.
I just want to see them fight like kids.
That's not a very nice thing to do, honestly. If you want to force people to fight then you need to calm down and rethink this, as it is extremely messed up and no one will like you afterwards.