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Definitely do the amp first. That’s the biggest problem. Then do the speakers. Then do the subs if you need it. Bavsound is a bit pricey but they are great. Totally plug and play and they have great support.
I replaced the hifi system in my F30 years ago and it was night and day. For the amp, there’s a guy on here that used to make/sell custom harnesses to make different amps plug and play. This was before Bavsound and others started making them specifically for BMW. He’s probably still here. I’ll have to check my messages.
Not sure if they’ve changed the hifi amp with something better, but it’s pathetic.
I put this beast in lol. Still going strong. The guy I sold the car to loves it.
Edited: his name is Technic and he’s still active. You might check with him for amp recommendations.
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