Purchased an '01 and would like to upgrade to the optional indash cd changer. Manual shows HU-803 4cd indash changer option. Has anyone done this on their own? Who is the best online source for volvo accessories? Does the CPU have to be reprogammed by dealer?

If you replace the radio yes there will be software needed to be installed for it to work.If you put an aftermarket radio in the factory radio needs to be removed with software.