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yes, but more information is needed. For example, if the lights are dimming, is it because the stereo pulls to much peak amperage, but typically leaves enough left for the car, or does it always pull to much, leaving you stranded when the alt dies or battery isn't able to charge. How many watts? How many amps do the fuses add up to? How efficient is the amp/amps? What are the symptoms causing you to suspect a cap is required? Sometimes a cap does nothing but use the money you should have spent on an alternator, sometimes it helps. Are the main power and ground wires upgraded/maintained at least? What distances are between the amp and alternator? What gauge cable is it using? Is there a meter handy to measure actual draws on the line? It's a hobby of mine...as a general rule, I've seen 1-2 farads per 1000 watts output suggested. Again, that may be a complete waste of money in your situation, and lower end caps (some) can be shown to put a heavier load on the system while providing no benefit at all.
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