Ok I just had a AVIC-F900bt installed into my 05 coupe and I used the metra 7551 harness to intigrate the stock amp and the sound is about half or less of what it used to be with the stock HU whats the problem??? also I would like to replace the stock amp and install an aftermarket one and connect the Bose speakers to the new one. has anyone done this and if you have please help.
if you have a diagram of the stock amp wires to whats what that would be great!