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I have a similar setup like you in terms of power output in my 01 330ci. I have a 2 alpine type r swr-1241d 12 inch with a mrv-1507 amp. I still run on a stock battery with a 1 farand cap and ive never had problems. I also have a mrv-f307 for my spx-177a component speakers. Getting a new battery would probably be a good idea for you and a 1-2 farand cap up to you so you have constant power supply.
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