Standard FG Audio Head Unit + After Market Amplifier

[Kesh]

Hi ASL,

I was just wondering about the possibilities of using Alpine Amplifiers with the Stock ICC and Head unit of an FG XR6.

Just as an example, there is a pack that Alpine supply:

MRX-V60 5/3 Channel Amp
SPS-610cg TYPE-S 6.5 ̋ Component Speaker
SPS-610g TYPE-S 6.5 ̋ Coax Speakers
SWS-1243D TYPE-S 12 ̋ SubWoofer

Could you confirm if the size of these speakers would suit an FG Sedan?

Is there a method to install these with the stock Head Unit?

Thank you very much for your time, I'm doing a little bit of research as my parents may be purchasing an FG falcon sometime soon.