yeah you can get a cap for aesthetics(as many people do) or to smooth out the spikes of current drawn. it is fine for our car, but as far as this goes:
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i do have a friend, however, who put a capacitor on a system with 600 watts on his chevy monte carlo. he had a problem with his light dimming when the system would hit hard. since he put it in, he has had no problems.
thats a common misunderstanding, all he is doing is making his lights contiunously dimmer so it isnt noticeable. if the ground and power are upgraded, and ur still having problems, you probly gotta weak alt. (i dont know the rating for that particular car). and a cap has to be charged, this works the alt. even harder, and eventually will die. most cars can handle a moderate stereo system, and our cars can even handle 1,000+ watts rms. but when its an obvoious alternator problem, please dont get a cap, it'll cost u more in the long run, i've talked to many people who have run their alternator into the ground
just a heads up for ur friend 
