I have some questions about cap or no cap? I am installing (2) JL 13W7's and (4) JL 8W3's in a Ford Excursion. I need to upgrade my alternator and bought a 20 Ferrite Tsunami cap (heard they were the best) and was contemplating a 2nd battery. But I have heard a lot of reasons not too.

I am running 2 new Memphis 1100.1 for the 13W7's
(1) Memphis 1100.1 for my (4) mid level 8W3's, and a kicker ZX650.4 for (4) Alpine type R 6x9's in the door panels, and (1) Kicker ZX100.2 running (2) Alpine Type E 6x9's in the real section, 3rd row seat area.

Would love some educated conversation. I am going for all sound quality with this set up, even though I could knock the windows out of the rice a roni kids cars that pull up next to me