I've got a '52' Omega B 2.2CD which is fitted with a siemens NCDC 2013 audio inc Satnav. I want to change it for an aftermarket CD that plays MP3s. I'm not bothered about losing satnav, info screen or steering wheel controls. However, I've been told that if I've got a Bose system I can't do it! Is there an easy way to tell if it is a Bose setup? Thanks