I have an e53 and well... I am planning on doing a whole new retro fit DIY project. It is going to include Navi and Bluetooth projects. Does anyone have any suggestions on any of this? I know that question is pretty vague, but to tell you the truth I am open to any and all words of advice, any tips on procedures & hardware, and any prayers you all may have? I am thinking of OEM 16:9 and an MKIV. I am prob going to get my hardware from bimmernav