Hi, probably over the weekend ill become owner of nice 407 HDI SW... somehow i like the car and ive always dreamed about it ok.. the car comes with RD4 audio and normal display, i think the orange one... my future plan is upgrade to RT4 or RT3evo ( like the hdd inside ) but as ive mentioned,that is future plan..here comes the question.. does all rd4 plays mp3? the 407 sw is 09/05.I like the big collour screen, can i update the screen and still using rd4? do i have to somehow allow the screen in computer? also i would like to add factory bluetooth ( dont know if is it there already ). the factory bluetooth is quite cheap on ebay, mic for £17, unit for £38. I know the unit needs to be connected somewhere close to pedals and the mic is going to interior light,but again, do i have to code it somehow? just like to keep everything as from factory, no aftermarket... thank you all for help.