M5: BMW 4 Dimension Car Audio Install Leave a Comment / Audio, Custom Fabrication / By Ultra Auto Sound Brand new F10 M5 Build Process Subwoofer firing forward to avoid trunk rattle JL Audio W6 subwoofer visible through ski hole. Suede Panel with Acrylic glass to see the impressive subwoofer. Lots of trunk space still available. Share This:FacebookTwitterEmailLike this:Like Loading... Related