I've recently sold by 2010 550i and have for sale an E60 Custom Fit Subwoofer box and JL Audio W6 12" Woofer. The box is perfect fit within the 550, and takes up about a 1/3 of the trunk. You'll be left with lots of space within the trunk. The box is done in the same fabric as the trunk so no one will know that it is in there.

$400

I'm located in the San Francisco Bay Area.

 

did you have the L7 system in your car? what kinda of amp did you have pushing it? thanx local buyer only?