Upgrade to XC90 Premium Sound System

[XCNinety]

I have an 03 plate XC90 with the standard High Performance Sound system. Does anybody know if it is possible to upgrade to the Premium system and if so how much would it cost? I assume it is just a change of software and the installation of the extra speakers. Cheers XCNinety.:thinking2:

[Razer]

Take a look in the S60 forum, its more complicated than that unfortunately, and of course more expensive....