where do you go to get a "better" alternator?
I've got several cars that all have systems, some better than others and if you watch closely, at idle, the headlights dim when the subs hit, and/or the idle will drop ever so slightly. Hooked up a voltage meter and you can watch it drop every time the subs hit. The GST I've got has a stock alternator and it only puts out 75 amps. I don't think the 240 or rx7 are much better. I would have to assume that an alternator with a higher amperage would have the nuts to sustain the added load.
Or am I attacking this from the wrong angle?

thanks for the help.