I'm going to try and keep this short, here is my question. I have an '05 rr and I want to upgrade the stereo/navi so I can use an mp3 player and use sirius. I saw what looked like the proper equip on bimmer.com. The stuff they had was bmw equip. Does anyone know what is really involved with an upgrade like that? And is it as simple as unplugging the exsisting system and plugging in the new one? Any info would be great.