Im curious as to why you say they do nothing. Not that I am saying you are wrong, but if its common knowledge that a 1F cap doesnt do crap, that information hasnt filtered down to the people who dont LIVE car audio.
And if the above IS true, then it just proves that experts dont know what the fuck they are talking about I guess. Since the EARLY 90s, I used to run extra batteries on a big power install.
I had an Orion 2250SX at the time. Orion recommended 2 batteries per 2250 in addition to the cars battery. They recommended atleast one extra battery. At that time caps were starting to gain momentum. I asked the guy at Orion about using caps, and he laughed, and said 'nope, they dont do anything, just do extra batteries'.....
At the time, sounded good to me, but over a very short course of time Orion seemed to be the only one saying such a thing. Rule of thumb was 1F per 1000W. It WAS the rule. Car Audio and Electronics(which used to be more than just a showcase) had articles saying so, amp manufacturers were saying so, the shops were saying so. Then I bought another 2250 a couple of years back and when I called Orion even THEY changed their tune too... Just put a farad cap on it they said.
So if all the 'dumb people' are thinking farad caps do something, its because all the 'smart people' said for the past 15 years that they did.

Totally overkill, but Im going to rewire the power distribution with 1/0 from the front battery. Im going to put in either one or two extra batteries in the bed, havent decided yet. But I also want to either redo the sub enclosure(may go back to a bandpass) or simply change out for a pair of 15s. Doing the bandpass means getting some mid bases that can keep up, which also means building an enclosure to fit them and installing another amp to run them. I am running out of space because for the most part, because everything is situated where you can't see it and I want to keep it that way. Also, I need a larger amp for mids and highs and probably new speakers for them too.