Upgrading 10 speaker system

[RyanS96]

I'm going to be upgrading my 2012 Mazdaspeed3 10 speaker BOSE system, I'm replacing the head unit with a Pioneer AVH-2500NEX, replacing all 9 speakers and sub. Starting to think I bit off more than I can chew, what's the best way of powering the system without needing 2 amps if it's even possible and can/should I utilize the factory wiring?

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