A little update. After wiring everything up and mulling over if I should add subwoofer or additional speaker, after playing it it was clear. The sound is fantastic and much louder than what my ears can handle. I’m no “car audio guy” but this is a deep and as loud as a subwoofer using 100w rms 6.5” door speaker and the tweeter mounted in place of the factory speakers. This thing BUMPS!
I placed my 8ohm 3.5” in the rear and hooked it up to the 4x100w amp and also tried it out powered by the factory amp in an Amazon Prime box as enclosure for shits and giggles. Box and port was the perfect dimensions. As if it were meant to be done. For shits and giggles.