Not baby related!

Me and my fiancé constantly fight about the same thing. His hobby is car audio and it's extremely expensive. He completely ripped everything out of his car and wants to "start over". Mind you, he just ripped out $12,000 of work.. I'm tired of hearing about what he needs and how much money he needs, especially because we have our first baby due in 29 days! I will never accept his hobby and he knows that. I'm literally at my wits end and I'm thinking about throwing in the towel. I just can't do it anymore. It can't be healthy to constantly fight about the same thing right? Would it be better to just give up or am I overreacting? Does your spouse have hobbies that you don't care for?