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The first step in upgrading the audio system is to determine what exact audio configuration is in the car. It sounds like your car may have the amp integrated into the head unit. That means adding an amp will require extensive wiring changes. Why? The head unit is sending out spreaker level signals to the speakers. Adding an amp would require extending those four wires to the left side of the trunk where a new amp would be mounted. The new amp will need to accept speaker level signals OR you would nedd to install 4 line level converter (LOCs) which convert speaker level signals to line level signals. I recommend the first solution. There are a number of high quality amps that accept speaker level signals.
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