I just bought a 1991 4 door buick regal gran sport. It doesn't have a cd player in it. I was wondering if I would be able to just add a cd changer in the trunk or somethin because if i try to put a head unit in the dash i would have to modify it. Is it possible to add a cd changer to a stock am/fm cassette player? If anyone could help I would appreiciate it.