I have a '99 540ia with the standard sound system. I agree with the comments on the board - it's not too good (that is being kind). The first improvement I would like to make is to add some bass. The standard system is lacking in the 'woofer' department. I have talked to a couple of shops, and they claim that the 5 series trunks are so tight, a sub will have a hard time getting sound into the cabin. I do not have fold down seats, nor ski sack. I would rather not cut into anything. Any suggestions? Also, a reputable installation company in the S Jersey area would be appreciated.
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