I've searched high and low to find info on the audio system in my car; it's not the Harmon Kardon system, but I do have Nav/COMAND with Sirius XM. Basically, I want to know what the stock speaker sizes are, where they are located, and if there is an external amplifier, where it is located. I want to upgrade/replace these components and also add a subwoofer; Any help any of you can provide would be greatly appreciated.
