soundstream 355

Ok, so I came across a bunch of my uncles old school car audio that he said I could have. Currently I have 2 HFX12d4s in my car right now, powered by an Arc Audio KAR 900.1D and Alpine SPS-610C's powered by a Hifonics zxi80.4. And I was wondering should I change out my subs and amps for any of...