Pa advise lang guys: Will go to Mickey's this Saturday to swap the stock stereo on my 2016 Kia Carnival with these:

1. New 2-DIN HU (maybe the Pioneer AVH X8850BT because of Car Play)
2. New 2 way separates (thinking of the Focal P165FX)
3. An under-seat active sub

That is the plan as discussed with Mickey but then I found this hardly-used Steg 120.2 Q-mos amp at home from a failed installation about 12 years ago (that's another story). Now I'm wondering if it will do any good to use this amp for the Carnival setup or just save it for another car another day. What do you guys think? Should I use the Steg to power the fronts? Diba overkill ang 120-wpc RMS?

Note: I'm not open to the idea of a passive subwoofer (heavy and lethal in case of a collision) which is why I'll settle for a small active sub. Thanks in advance.