Has any got or made a e91 sub box that fits in the boot space, or know of a place that does them i found 1 online from the uk shipped will be about $300 give or take other then the bavsound ghost sub but don't really feel like paying $800us for it.
something along the lines of this
http://www.e90post.com/forums/showthread.php?t=848135
any help would be great
Thanks.