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You should have either 6.5" or 8" woofers underneath the seats. You can replace with something like Earthquake SWS 8" and power it independently, but that's about the only thing that will fit. You will have to deal with a sound profile change from stock that won't be very impressive unless you some compensation with some sort of audio equilization. I did this with our 2007 530i and thought stock was better. Problem is that the SWS can't do much midbass, so unless you compensate for that elsewhere in your system, it sounds worse.
Adding a sub in the trunk area will probably give better results.
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