Hi New one to this forum but I just recently bought my 407 SE and I am looking for so info regards the RT3 Sat'Nav/GSM Phone Headunit available. I bought my 407 used (10months with 4k on the clock) and as a result I wasn't able to pick my own spec' but was extremely happy with what I was getting hence I bought. However, now that I have it I find that I am more and more needing Sat' Nav' for work and also find the GSM Phone feature of the RT3 to be a fantastic idea/set-up. At the moment I have the RD4 unit but is it possable to simply buy the RT3 and take out the RD4 and replace it with an RT3. I know it works with the colourless Mono screen of the RD4 that I have at present so I wouldn't need to fork out extra for the colour screen, though may do so in the future. Can I though simply 'plug and play' the RT3 with the current set-up. I.e. Is all the wiring there for it and it simply needs to be plugged in/installed? I don't wan to go pay a Peugeot dealer £100's of pounds extra to install it when I can do it myself with the help of a friend whom is a mechanic? Help greatly appriciated. Neil :-)