Hi All,

I want to upgrade audio in my 2005 X5 3.0d too. There is no dsp, no separate amp. I think I just have BM54 unit. I searched every thread but USA spec X5 have separate amps or dsp with sub, so I cannot figure it out. What I want to do is replace speakers with better ones (maybe a sub) and feed them with an amp and keep the stock unit (bluetooth,fm vs). I also installed gromaudio through cd changers cable. How can I upgrade it without tearing apart my car?? I am residing in Europe, so bavarian sound is also not an option. Thanks