The majority, VAST majority of caps do very very little if anything at all except can help with dimming lights sometimes, way to much myth and very little facts around about caps.
What does work better that all regular caps is Batcaps by Xstatic, they are costly but are amazing and I have seen them in action in world class comp cars built by some of the top installers ever. They are a battery and capacitor all in one.
My personal favorite is the Supercap by them, 50 real farads in under 2 lbs, I have seen them do things totally unbelievable until you witness it.
I am having something similar made for our comp car that does 66 Farads
BUT, they alone are just a part of the equation, you will need a much larger alternator, wiring of course and stiffer rear springs
Check out the post on our 15" sub install and comps we have done so far, totally stock electrical system and works incredibly well. Once we get it all done we should be in the mid to upper 140's with only a ten lb weight gain.
Rick