Factory crossover setup on 8.4 non-Alpine 6 speaker system...

[2010 Infantry Vet]

Should i consider adding something like these Kickers in the dash or just the Focal components in the doors? (Kicker 44KSC3504 3-1/2" 2-way car speakers)

https://www.crutchfield.com/p_206KSC3504/Kicker-44KSC3504.html

On sale for $50.

Depends on what your funds allow for. Personally, I would not reccomend any full range 3.5” speakers in the dash. A good set of components amplified with enough power is night and day verses stock. Like someone else said, if you can afford it, return your components, and get a 3 way set...or add midrange speakers in the dash like I did. If you go my route, you can use a seperate two channel amps crossover to set the low freq running to the midranges.
When i added 3.5” infinity 300M dash midranges, it all came together very nicely!
https://www.crutchfield.com/p_108PERF300/Infinity-Kappa-Perfect-300m.html