Help with replacing factory speakers and adding an under seat subwoofer and amp

I have a 2021 SX Prestige. I would like to upgrade the factory speakers, possibly the amp, and add a subwoofer under the front seat (both front seats, if possible. But, I know the factory speaker amp is under the passenger seat so that likely can't happen). I am not at all interested in drilling and or adding anything (subwoofer, amp, etc. to the back under the false floor or anywhere else where there aren't already speakers or an amp) to any area that otherwise has speakers (aside from...

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