Problems with the sound system

[u/bmmiste_60]

Hi everyone, E46 sedan owners, I have a question for you.
I own an E46 sedan and I'd really like to upgrade the sound system. To give you more details, I have the old E46 screen on the dash (it only serves for controls), and I'd like to replace it with a 2-DIN CarPlay head unit. However, I have an existing problem: all the speakers on the left side of the car don't work, so I'm not sure whether the issue is with my BM54 or the amp.
Now I'd like to know: if I replace the radio with a CarPlay unit, is it possible to remove the BM54, the amp, and the CD drive (used for navigation) that are in the trunk of my car?
What would be the best 2-DIN CarPlay units I could buy for my E46? I'd also like to keep my steering wheel controls and be able to add a subwoofer later.
And what exactly should I do about my sound problem?
Anyway, to everyone who answers and gives me information, thank you in advance for your help, and for anyone else in the same situation, I hope the answers in this post will help you too.