Quick note on caps:
-Caps are pretty much always a good thing to have with amps, as a rule of thumb you want 1 Farad for every 1000 watts of rms power.
-Caps basically function as a quick discharge power reserve. This serves 2 main purposes. 1 it saves your bat and alternator from being damaged or having their lives shortened by uneven and demanding power draw from the audio system. It also keeps the "disco" (lights dimming ect) effect from happening alot of times when a big draw occurs. 2 it makes your system sound better by giving it the power it wants. This is especially true in the case of sustained bass, where you have the 1st bass beat sound full, and then weaken due to a lack of power.
-Caps should be installed as close to the amp/amps as possible. Less distance traveled means faster power delivery
-You can use caps as a distribuiton point, but it's not advisable.
-With multiple amps, it's best to run a higher gage wire 1 or 4 from bat to fuse to cap, then to a distrib block. Then run smaller gage out of the block 4 or 8.
Here is a good diagram for a single amp install
Answer
A couple of other notes on caps.
-Not all caps are created equal, there is a very clear deliniation and price differences between caps. The rate of discharge, peak voltage, voltage rating and other factors determine the quality of the capacitor.
Your better brands, Rockford/Monster will typically retail for about $150/1Farad
Your cheaper brands tsunami/lightning audio etc will typically retail about $79.99-99.99/1Farad
For very large and demanding system you might see caps of 25/50/100 farads, this is not the actual rating in most cases, and it actually runs between 4-10farads but with the ability to deliver more burst power.
As with most things ultimately you will get what you pay for
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