I have a 2003 B6 S4 and I'd like to upgrade the speakers with direct replacements from a quality manufaturer. I don't spending some money but I do not want to hack or modify my door cards and other areas of the interior. Any ideas? I know ALpine used to do an OEM replacment range but it seems the yhave stopped that now. Mine is a saloon with Bose but that shouldn't make a difference. The next step would be retro fittign a sub box and havign the Bose amp drive that to keep it as close to OEM as possible. I'd mak the sub box removable for when the boot is filled with luggage. Any ideas anyone? Any help/advice woudl be greatly appreciated.