Caps are pointless to an extent. 10 farad cap pointless.. 1 farad cap pointless unless you have done everything else like upgrade ground, power and alt wires aka the big 3. Then for how much your cap cost you can get a Yellow top that acctually will work! That in its self will prove that caps are worthless.
Caps are a selling tool by car audio companies and stores to make extra money by giving false hopes. I have never owned a cap in my life. when someone in this forum runs a Amp larger than a Soundstream Tarantula the 2000 watt rms one let me know and explain why you need a cap. Becuase i had one in my CSVT with a yellow top and lights never dimmed, or anything. ya if i took it off the cars main battery then the draw of 155amps (ya it was bench tested) would spell major problems for the 130a alt in the contour. and all the caps in the world wouldn't help the problem. Its good for instant spikes but most music is very fast paced and a cap can't keep up then it puts a strain on the electrical system to charge it.
The alumapro 50 farad cap is cool if you feel the need to waste money. If one needs a cap that large then do your self a favor and just get a few yellow tops you obviously have the room for them