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the audio in the m5 is very tightly integrated with... everything... however, you can certainly do speakers- high end car audio speakers seem to have a very positive effect on the quaility of the m5 stereo.... or you can rip out everything and install good old fashion stereo. but you will lose nav, trip computer, etc.
what i am tryin to say is that there isnt much to play with in the m5. sure, you can buy harnesses and piggyback amps and other stuff, but the m5 has enough electrical problems as is by default.
alex
00 m5
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