Well, I decided to upgrade my original BMW stereo with a good Rockford Fosgate amp I own, new Focal speakers (excellent french brand) and a Macrom bass tube. Isn'it a good idea ?
So...here is my problem : where and how do you link the wires betwenn the trunk and the dashboard (the radio) ? Have the wires be under the top system or along the car ? Do you have a scheme ? I need help ! Thanks a lot. Vincent