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Do you have iDrive?
If not, you have the option to upgrade your head unit, however you would have to buy the following: double din dash kit, wiring harness, alpine head unit, 6 channel amp, sub amp, kicker sub, amp bypass harness. (basically you have to bypass the oem speaker amp since the MOST system uses optical)
If yes, your best bet would be to just run a high-low pass converter for a subwoofer and not try to upgrade the head unit. You would have to buy the following: High/Low Pass converter, sub amp, kicker sub (this option can also be used in lieu of the above suggestion, it is less money/complex)
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