Hi everybody, glad to be here and looking forward to a successful and pleasurable ownership of an E39. Here we go...my wife for my 50th birthday, bought me the car I always had wanted. Long question shortens. It was fitted with a Chinese head unit of which I could find "no" info, no online instructions. I want rid. I want to install a parrot asteroid smart. I have read with interest about new wiring looms, etc, to the back of the car. Would I still need these considering the after market head unit works fine..(possibly made by saicane).