Hi Guy's, I have a 2008 GT convertible with the shaker 500 stereo system. It was working great and all of a sudden it seems a door sub-woofer has started rattling something terrible! Is there an aftermarket plug and play replacement available that won't damage the stereo? I've heard "Kicker", Rockford Fosgate" and others. Has anyone upgraded just their speakers and/or woofer's and if so what did you use???