thanks Mouse. I'll stick with the current set-up I have since that sub hits HARD, like Mike Tyson hard. I will just continue to live with the box in trunk.

EDIT: I made my own homemade box by modifying the factory box. removed both 6" speakers and cut off face to install MDF and 10" shallow mount and its incredible! SO HAPPY to have a full trunk space again and sub sounds about 80% as good as other 10" sub in external sub (which was over kill)

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I swear, my cars are like a girlfriend.
Sometimes its a rough ride, sometimes its smooth motorin'.
Sometimes she doesnt like how i treat her and sometimes i dont like how she behaves.
BUT at the end of the day, she loves it when I am inside her.

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'91 850i
'05 X5 4.4i
'09 Clubman S