Hello guys, now I’ve been looking for 2 weeks in the most different forums, but unfortunately I haven’t found an answer. I’m totally confused on the contrary. It’s easy for me to do so. I want to upgrade an Omega BJ 07/1999 with a CCRT 700 complete with phone, Bose and Onstar on navigation. I’ve now found there are carin 420 etc. But is, I think, outdated?. There is probably also the possibility to change the radio including the display where now there are carin 420 etc. And what do I really need? What would really be good for me if the Navi with TMC and that could also run over the ondhifi system.Rejoice me about your help