I have been told that the car is "pre-wired" to accept Satellite Radio (Sirius). Does anybody know how much of the car's interior/trim has to be messed with to make the installation? I'm sure a satellite receiver has to be installed in the trunk, and a Satellite antenna has to be mounted somewhere high on the body. Has anyone seen this dealer install or the antenna? Do they send the car and the kit to a local stereo/trim shop for the install? ...or do they slap it in & hope for the best?