Scuderia Audio presents an upgrade path for the large subwoofer in the center of the rear package try for your Maserati GranTurismo.
Replace your existing Bose speaker with a monster 9 inch German made subwoofer (6 1/2 pounds!).
Includes a stainless steel, laser cut, tig welded adapter plate that allows you to bolt the new subwoofer to your rear package tray with no modifications of any kind. Better bass, guaranteed.