Speaker ratings are meaningless. Have a klippel? Those results would help. I'm really not sure about all the sound options in 04+. I'm definitely not aware of a factory amp behind the glove box but I ran new wires n' such :/ I think the point I'd like to make is that your speaker selection determines the hardware necessary for your install.
If you look at my install photos my rear deck was absent an OEM amplifier before I added mine. Are you just trying to determine what stereo option came installed in your vehicle?
