When upgrading the stock-non Bose sound, is there any guides or references out? I would have loved one of those A3 replacement sub boxes but living in Africa means there is no chance of getting it here... but will see what's available in any case. Do you need adaptor plates for the door speakers etc. I want to upgrade the sound in my car and just want to get an idea of what I'm in for. Thanks! WIll search for more in the forum and add to this when more questions arise.