It depends on whether you have the standard audio system or a premium sound system. The standard system has no factory amplifier, the premium system has a factory amp and some other gimmicks that are hard to interface with. A proper OEM amplifier upgrade will require changing the factory speakers with stronger replacements, as well as adapting the factory head unit output to a signal your new amplifier will like. More often than not, it is more economical and better sounding to just change the factory speakers and run the replacements off your factory system. To drastically improve the sound system, it is more effective to just change everything.
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