Just like MarcoZandrini mentioned, all U.S. spec vehicles should come with the HiFi installed...which means a small amp in the left side of the trunk (just behind the lights-ish). Option number is 676 if you're looking for it in the spec sheets.
When I upgraded my speakers and needed to add tweeters, I ordered the harman-kardon tweeters (51337269361 and 51337269362). I kept the covers and dumped the included tweeters.
I'm sure there are much more experienced audiophiles in this forum, but if you're thinking of upgrading the stock hi-fi amp, I would go with something a bit more capable than the HK amp, depending on your budget.
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