I have an original pair of 10" M-Audio subwoofers out of a 2003 M5 (E39).
This mod will replace your crappy Nokia subwoofer box + free up additional trunk space.
See mod ~> http://www.bmwtips.com/tipsntricks/t...e%20review.htm
These subs, made with kevlar cones, are in mint condition and will yield significant more bass w/out the need of an additional amplifier.
(Though, even better, if you decide to power them seperately w/ an additional amp)
Priced @ C$350 or they're going into my car.
Please contact me via PM or e-mail me at firstname.lastname@example.org
: My reason for considering a sale is that I found a used BSW box.....so if interested...please don't delay.