After putting the trunk liner back on the left side things start to look a lot cleaner. You can now see the speaker basket sitting installed. I wrapped it in some carpet to help keep it closed (I had to break the glue seal that was originally holding it together). And there's the trimmed down cable for the sub terminated with banana plugs.



Putting the last piece in its place, the subwoofer enclosure:



A single 10 in such a small enclosure leaves ample trunk space. Well, ample for a 3 series...