I'm looking to swap out the factory radio with a Sony CDX-GT430IP. Has anyone made this switch and if so what should I watch for? I've read the posts about programming the computer to not look for the factory radio. The shop I'm using claims to have done several and never had a problem. He claims it's a matter of using the correct harness. I'm a little nervous about it because of what I've read here and on other forums. I have an '04 S60. Thanks