I noticed when I put my stereo and speakers in the 7 that the speakers aren't very loud. Someone had already bypassed the amp for the front speakers but not the rears. I have an '88 GXL and when I removed the rear speakers they were not the kind with built in amps. I have to assume then that te factory stereo was wired as shown below. Does anyone know where the stock amp location is? I don't see it in the FSM.